This review assessed the effect of strategies designed to sustain the delivery of evidenced based interventions (EBIs) which target behavioural risk factors linked to leading causes of chronic disease in clinical and community settings. Seven electronic databases were searched for randomised controlled studies published from earliest record to November 2022. Studies were included if they tested a strategy to sustain the delivery of an EBI within clinical or community settings. Results were synthesised using vote counting based on direction of effect, and reported in accordance with non-meta-analytic review standards following the Synthesis Without Meta-analysis (SWiM) guidelines. Three studies met the study inclusion criteria. Two studies were community-based, with one conducted in Australian community sports clubs and the second in afterschool clubs in the United States. The single clinical-based study was conducted in community health care centres in the United States. Across the three studies, 25 strategies were employed and only two strategies were common across all studies. Synthesis using vote counting based on direction of effect indicated that two of three studies favoured the intervention as positively impacting sustainment of EBIs. Few studies have been conducted to assess the effect of strategies designed to support sustainment of EBIs for chronic disease prevention in clinical and community settings. As such, it is difficult to determine the effect of strategies designed to support sustainment. Further research with comprehensive reporting of the selection, use and testing of sustainment strategies is needed to advance understanding of how to sustain EBIs in clinical and community settings.

Background:The primary purpose of this review is to synthesise the effect of strategies aiming to sustain the implementation of evidenced based interventions (EBIs) targeting key health behaviours associated with chronic disease (i.e., physical inactivity, poor diet, harmful alcohol use and tobacco smoking) in clinical and community settings. The field of implementation science is bereft of an evidence base of effective sustainment strategies, and as such this review will provide important evidence to advance the field of sustainability research. Methods:This systematic review protocol is reported in accordance with the Preferred Reporting Items for Systematic review and Meta-Analysis Protocol (PRISMA-P) checklist (Additional file 1). Methods will follow Cochrane gold-standard review methodology. The search will be undertaken across multiple databases, adapting filters previously developed by the research team; data screening and extraction will be performed in duplicate; strategies will be coded using an adapted sustainability-explicit taxonomy; evidence will be synthesised using appropriate methods (i.e. meta-analytic following Cochrane or non-meta-analytic following SWiM guidelines). We will include any randomised controlled study that targets any staff or volunteers delivering interventions in clinical or community settings. Studies which report on any objective or subjective measure of the sustainment of a health prevention policy, practice, or program within any of the eligible settings will be included. Article screening, data extraction, risk of bias and quality assessment will be performed independently by two review authors. Risk of bias will be assessed using Version 2 of the Cochrane risk-of-bias tool for randomised trials (RoB 2). A random effect meta-analysis will be conducted to estimate the pooled effect of sustainment strategies separately by setting (i.e. clinical and community). Sub-group analyses will be undertaken to explore possible causes of statistical heterogeneity and may include: time period, single or multi strategy, type of setting and type of intervention. Differences between sub-groups will be statistically compared. Discussion/Conclusion:This will be the first systematic review to determine the effect of strategies designed to support sustainment on sustaining the implementation of EBIs in clinical and community settings. The findings of this review will directly inform the design of future sustainability-focused implementation trials. Further, these findings will inform the development of a sustainability practice guide for public health practitioners. Registration:This review was prospectively registered with PROSPERO (registration ID: CRD42022352333).

Abstract Background Dads and Daughters Exercising and Empowered (DADEE) is a program targeting fathers/father-figures to improve their daughters’ physical activity and well-being. Previous randomised controlled efficacy and effectiveness trials of DADEE demonstrated meaningful improvements in a range of holistic outcomes for both fathers and daughters in the short-term. This study aims to assess the long-term impact (12-months) of the program when delivered in the community by trained facilitators. Methods Fathers/father-figures and their primary school-aged daughters were recruited from Newcastle, Australia into a single-arm, non-randomised, pre-post study with assessments at baseline, 10-weeks (post-intervention) and 12-months. The 9-session program included weekly 90-min educational and practical sessions, plus home-based tasks. The primary outcome was fathers’ and daughters’ days per week meeting national physical activity recommendations (≥ 30 min/day of MVPA for fathers, ≥ 60 min/day MVPA for daughters). Secondary outcomes included physical activity, screen time, self-esteem, father-daughter relationship, social-emotional well-being, parenting measures, and process outcomes (including recruitment, attendance, retention and program acceptability). Results Twelve programs were delivered with 257 fathers (40.0 ± 9.2 years) and 285 daughters (7.7 ± 1.9 years). Mixed effects regression models revealed significant intervention effects for the primary outcome, with fathers increasing the days/week meeting physical activity recommendations by 27% at 10-weeks (p < 0.001) and by 19% at 12-months (p < 0.001) compared with baseline. Likewise, for daughters there was a significant increase by 25% at 10-weeks (p < 0.001) and by 14% at 12-months (p = 0.02) when compared to baseline. After conducting a sensitivity analysis with participants unaffected by COVID-19 lockdowns (n = 175 fathers, n = 192 daughters), the primary outcome results strengthened at both time-points for fathers and at 12-months for daughters. Additionally, the sensitivity analysis revealed significant intervention effects at post-program and 12-months for all secondary outcomes in both fathers and daughters. Furthermore, the process outcomes for recruitment capability, attendance, retention and satisfaction levels were high. Conclusions Findings provide support for a sustained effect of the DADEE program while delivered in a community setting by trained facilitators. Further investigation is required to identify optimised implementation processes and contextual factors to deliver the program at scale. Trial registration ACTRN12617001450303. Date registered: 12/10/2017.

Background Utilising fathers to support their daughters and enhance their cricket skills may be an innovative approach to addressing traditional socio-cultural views of cricket relating to gender, by improving girls’ enjoyment, participation and long-term retention in in the sport. Purpose To assess the feasibility of the ‘Daughters and Dads Cricket’ programme. Methods In a single-arm, pre–post study, fathers (n = 34, 43.1 ± 4.4 years) and daughters (n = 34, 9.4 ± 1.5 years) from Newcastle, Australia were recruited. The 9-week programme was delivered by trained facilitators and included weekly educational and practical sessions, plus home-based tasks. A priori feasibility benchmarks targeted recruitment (20 dyads), fidelity (≥80%), attendance (≥70%), compliance (≥70%), satisfaction (mean: ≥ 4/5) and retention (≥85%). Preliminary efficacy outcomes included cricket skill proficiency, daughters’ enjoyment in cricket, intention to keep playing cricket and long-term retention in cricket. Results Feasibility benchmarks were exceeded for recruitment (n = 34 dyads), fidelity (98% education, 100% practical), attendance (88%), satisfaction (fathers: 4.6 of 5, daughters: 4.8 of 5) and retention (97%). Home-programme compliance fell short of the benchmark (64%). Preliminary efficacy was confirmed with medium-to-large effect size changes in 11 of the 13 daughters’ cricket skill proficiency outcomes. Promising findings were identified for daughters’ enjoyment of cricket, intention to continue playing and long-term retention in cricket. Conclusion A cricket-focused programme targeting daughters and dads was feasible and led to medium-to-large improvements in cricket skill proficiency among the daughters. Additionally, daughters were engaged with cricket, as shown by high levels of enjoyment, intention to continue playing and their long-term retention. Examining future efficacy in a larger trial is warranted.

'Healthy Youngsters, Healthy Dads' (HYHD) targets fathers to improve the health of their preschool-aged children. In a previous randomized trial, fathers and children experienced meaningful improvements in physical activity and eating behaviours. The next phase is to test the replicability and adaptability of HYHD when delivered in the community by trained facilitators. Fathers/father-figures and children aged 3-5 years were recruited from Newcastle, Australia into a 9-week, non-randomized trial with assessments at baseline, 10 weeks, and 12 months. The primary outcome was achievement of pre-registered targets for recruitment (>= 96 dyads), attendance (>= 70%), compliance (completing >= 70% of home-based tasks), fidelity (>= 80% of content delivered as intended) and program satisfaction (>= 4/5). Secondary outcomes included physical activity, nutrition, screen time and parenting measures. Process targets were surpassed for recruitment (140 fathers, 141 children), attendance (79% for fathers-only workshops, 81% for father-child sessions), compliance (80% of home-tasks completed), fidelity (99% for education, >= 97% for practical) and program satisfaction (4.8/5). Mixed effects regression models revealed significant effects in fathers for moderate-to-vigorous physical activity, co-physical activity, dietary intake and parenting practises, which were maintained at 12 months. Significant effects were also established for screen time at 10 weeks only. For children, significant effects were observed for screen time and dietary intake at 10 weeks, while effects on energy-dense, nutrient-poor foods and healthy, nutrient-dense core food intake were maintained at 12 months. Findings demonstrate the replicability and adaptability of HYHD when delivered in the community by local trained facilitators. Further investigation into how to optimally scale-up HYHD is warranted.

This study evaluated the effect of the Dads And Daughters Exercising and Empowered (DADEE) program on daughters' social-emotional well-being when delivered by trained facilitators. Fathers (n = 158; Mage = 41.95 ± 5.32 years; 86% Australian born) and daughters (n = 193; Mage = 8.35 ± 1.85 years) from Newcastle, New South Wales, Australia, were randomized into (a) the DADEE intervention or (b) a wait-list control. At baseline and 3 months, fathers, daughters, and mothers completed validated scales of daughters' social-emotional well-being (main outcome of interest), daughters' self-esteem, and other family-related outcomes. Intervention daughters improved their social-emotional well-being from father and mother perspectives compared to the control group (d = 0.51-0.64). Intervention effects were observed for the father-daughter relationship, indicators of father involvement, fathering warmth, coparenting, and family-related well-being, but not daughters' self-reported self-esteem and family-related well-being. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

The Healthy Dads, Healthy Kids (HDHK) program was designed to help fathers with BMI ≥ 25 kg/m 2 to lose weight and positively influence physical activity and dietary behaviors of their children. There is a need to better understand the broader impact of father-focused, healthy lifestyle programs from the perspectives of other family members. This qualitative study explored the impact of a HDHK by gathering insights from the family unit (fathers, mothers/partners and children). Fathers and children who participated in the HDHK dissemination trial from the Maitland local government area (New South Wales, Australia) ( n = 33) and all mothers/partners of participating HDHK were invited to take part in this qualitative study. Eleven focus groups were undertaken with 25 fathers (41.9 ± 6.3 years, 32.4 ± 5.1 kg/m 2 ), 15 mothers/partners’ (38.1 ± 6.6 years), and 41 children (51% male, 8.2 ± 2.1 years). Audio recordings were transcribed and analyzed by an independent researcher using a standard general inductive approach to qualitative analysis with thematic analysis applied. Three key themes emerged, demonstrating several personal and family program impacts. These included a positive impact on: (i) the father-child relationship, (ii) new family habits (e.g., lifestyle changes within the family unit) and (iii) fathers’ involvement and parenting practices (e.g., increase in fathers’ household responsibilities). Improving the knowledge and skills of fathers and children through evidence-based strategies may be a useful approach to strengthen their relationship, enhance parenting strategies, and optimize health behaviors. Notably, findings showed the changes made by the fathers and children positively impacted the wider family unit.

Abstract Background Governments internationally have invested hugely in the implementation and scale-up of school-based physical activity interventions, but have little evidence of how to best sustain these interventions once active implementation support ceases. This study will assess the effectiveness of a multi-strategy sustainability intervention on classroom teachers’ sustainment of energisers (short 3–5 min physical activity breaks during class-time) scheduled across the school day from baseline to 12 and 24-month follow-up. Methods A cluster randomised controlled trial will be conducted in 50 primary schools within the Hunter New England, Illawarra Shoalhaven, Murrumbidgee and Northern New South Wales (NSW) Local Health Districts of NSW Australia. Schools will be randomly allocated to receive either usual support or the multi-strategy sustainability intervention that includes: centralised technical assistance from a trained project officer; formal commitment and mandated change obtained from school principals; training in-school champions; reminders for teachers; educational materials provided to teachers; capturing and sharing local knowledge; and engagement of parents, carers and the wider school community. The primary trial outcome will be measured via a teacher logbook to determine the between-group difference in the change in mean minutes of energisers scheduled across the school day at 12 and 24-month follow-up compared to baseline. Analyses will be performed using an intention to treat framework. Linear mixed models will be used to assess intervention effects on the primary outcome at both follow-up periods. Discussion This study will be one of the first randomised controlled trials to examine the impact of a multi-strategy sustainability intervention to support schools’ sustainment of a physical activity intervention. The proposed research will generate new evidence needed for the partnering organisations to protect their considerable investments to date in physical activity promotion in this setting and will provide seminal evidence for the field globally. Trial registration ACTRN12620000372987 version 1 registered 17th March 2020. Version 3 (current version) updated 4th August 2023.

Background Targeting fathers may be a key strategy to increase physical activity among their preschool-aged children, but limited research exists in this area. The primary study aim was to examine the impact of a lifestyle program for fathers and their preschool-aged children on child physical activity levels. Methods A total of 125 fathers (aged: 38 ± 5.4 years, BMI: 28.1 ± 4.9 kg/m 2 ) and 125 preschool-aged children (aged: 3.9 ± 0.8 years, BMI z-score: 0.3 ± 0.9, 39.2% girls) recruited from Newcastle, Australia, NSW were randomised to (i) the Healthy Youngsters, Healthy Dads (HYHD) program, or (ii) wait-list control group. The program included two fathers-only workshops (2 h each) and eight father-child weekly educational and practical sessions (75 min each), plus home-based activities targeting family physical activity and nutrition. Assessments took place at baseline, 10-weeks (post-intervention) and 9-months follow-up. The primary outcome was the children’s mean steps/day at 10-weeks. Secondary outcomes included: co-physical activity, fathers’ physical activity levels and parenting practices for physical activity and screen time behaviours, children’s fundamental movement skill (FMS) proficiency, plus accelerometer based light physical activity (LPA) and moderate-to-vigorous physical activity (MVPA), screen time and adiposity for fathers and children. Process measures included; attendance, satisfaction, fidelity and retention. Linear mixed models estimated the treatment effect at all time-points for all outcomes. Results Intention-to-treat analyses revealed a significant group-by-time effect for steps per day at 10-weeks (+ 1417, 95%CI: 449, 2384) and 9-months follow-up (+ 1480, 95%CI: 493, 2467) in intervention children compared to control. There were also favourable group-by-time effects for numerous secondary outcomes including fathers’ physical activity levels, children’s FMS proficiency, and several parenting constructs. No effects were observed for both fathers’ and children’s accelerometer based LPA or MVPA, co-physical activity, screen-time and adiposity measures. Process evaluation data revealed very high levels of satisfaction, attendance, retention, and intervention fidelity. Conclusion Engaging fathers in a lifestyle program is a promising strategy to increase physical activity among preschool-aged children. Additional benefits to fathers’ physical activity levels, children’s FMS proficiency and parenting practices further support the importance of engaging fathers to improve family health outcomes. Trial Registration Australian New Zealand Clinical Trials Registry: ACTRN12619000105145 . Registered 24/01/2019.

Background: Children can internalise social and parental gender stereotypes and this may influence their perceived motor competence (PMC). This study aimed to examine the association between father and daughter gender-stereotyped attitudes/beliefs and girls' PMC. Methods: Girls (N = 68, M-age = 8.9 years, SD= 1.7) and their fathers were recruited at baseline from a physical activity intervention. Girls' PMC was assessed using the pictorial scale of Perceived Movement Skill Competence. Gender-stereotyped attitudes/beliefs of girls and fathers were assessed using the Occupation, Activity, and Trait - Attitude/Personal instrument. The girls' questions were interviewer administered to ensure comprehension, whilst fathers completed an online survey. Correlations were calculated, followed by linear regressions adjusted for girls' age and fathers' education. Regression models were used to investigate associations between father-daughter gender-stereotyped attitudes/beliefs, and whether these attitudes/beliefs were associated with girls' perceptions of their object control/locomotor, active play, and overall skill competence. Results: Girls' gender-stereotyped attitudes negatively correlated with overall PMC, r(60) = -.36, p =.004, and object control perception, r(60) = -.36, p =.004. These associations remained evident in linear regression analysis. No other associations were found. Conclusions: Girls with more gender-stereotyped attitudes have lower motor skill perceptions, which may impact negatively on physical activity and sport participation. Future interventions aimed at reducing sociocultural gender stereotypes in children may improve girls' motor skill perception and positively impact physical activity.

(1) Background: The effect of fathers on dietary intake in preschool-aged children is under-explored. The aims were to: (i) evaluate the efficacy of a family-based lifestyle intervention, Healthy Youngsters, Healthy Dads, on change in dietary intake in fathers and their preschool-aged children post-intervention (10 weeks) and at 9 months follow-up compared to a waitlist control group and (ii) investigate associations in father–child dietary intakes. (2) Methods: Linear mixed models estimated group-by-time effects for all dietary outcomes, measured by food frequency questionnaires. Cohen’s d determined effect sizes, while correlation tests determined associations in father–child dietary intakes. (3) Results: For children, medium group-by-time effects sizes were identified at 10 weeks for sodium intake (d = 0.38) and percentage energy from core foods (d = 0.43), energy-dense, nutrient-poor (EDNP) foods (d = 0.43) and prepacked snacks (d = 0.45). These findings were sustained at 9 months follow-up. For fathers, medium to large, group-by-time effect sizes were identified at 10 weeks for energy intake (d = 0.55), sodium intake (d = 0.64) and percentage energy from core foods (d = 0.49), EDNP foods (d = 0.49), and confectionary (d = 0.36). For all of these dietary variables, except sodium, effects were sustained at 9 months. Moderate to strong associations existed in father–child dietary intakes for some of the dietary variables. (4) Conclusions: Although further research is required, this study provides preliminary support for targeting fathers as agents of change to improve dietary intakes in their preschool-aged children.

Background The 'Dads And Daughters Exercising and Empowered' (DADEE) program significantly improved physical activity levels of fathers and their daughters in an efficacy trial. However, the effectiveness of interventions when delivered in real-world settings needs to be established. Purpose To evaluate the effectiveness of the DADEE intervention when delivered in community settings by trained facilitators. Methods We conducted a two-arm RCT, (baseline and 3-months post-intervention assessments), in Newcastle, Australia. In 2016, 155 fathers (27-60 years) and 189 primary-school-aged daughters (4-12 years) (n = 344) were randomly allocated to the intervention (78 fathers, 95 daughters) or waitlist-control (77 fathers, 94 daughters) groups. Trained facilitators delivered the 9-week DADEE program (weekly sessions plus home-based tasks). Primary outcomes were fathers' and daughters' physical activity (steps/day). Secondary outcomes included screen-time, weight status, daughters' fundamental movement skill (FMS) proficiency, perceived sports competence, and fathers' parenting practices. Effects were assessed using linear mixed models. Results Primary outcome follow-up data were collected from 88% of fathers and 89% of daughters. Significant group-by-time differences in mean daily steps were found for fathers' (adjusted difference = +1,638; 95% CI: 833, 2,443, d = 0.7) and daughters' (adjusted difference = +1,023 steps/day; 95% CI: 259, 1,787; d = 0.4) physical activity. Significant effects were observed for daughters' screen-time, FMS, and some parenting practices. No significant effects were identified for weight status, or fathers'screen-time or self-reported MVPA. Program attendance, satisfaction and fidelity were very high. Conclusion This study established the effectiveness of the DADEE intervention when delivered in community settings by trained facilitators. Importantly, the findings were comparable to those of the efficacy RCT delivered by the research team. To maximize public health benefits, a larger-scale dissemination of the program appears warranted. Trial Registration Australian New Zealand Clinical Trial Registry: ACTRN12616001270404 Human Research Ethics Committee: H-2014-0330

BACKGROUND:Few lifestyle programs for young children have targeted fathers. This study examined the feasibility of a lifestyle intervention for fathers and their preschool-aged children.METHOD:A total of 24 father/preschool child dyads were recruited from Newcastle, Australia, into a single-arm, feasibility trial (baseline and 3-mo postbaseline assessments). The 9-session program aimed to improve physical activity and dietary habits of fathers and children. A priori feasibility benchmarks targeted recruitment (15 dyads), eligibility rate (>60%), attendance (80%), retention (≥85%), and program acceptability (≥4 out of 5). Acceptability of data collection procedures, research team program/resource management, home-program compliance, and preliminary intervention outcomes were also assessed.RESULTS:Feasibility benchmarks were surpassed for recruitment (24 dyads), eligibility rate (61.5%), attendance (89%), retention (100%), and program acceptability (4.6 out of 5). Data collection procedures were acceptable. Challenges included mothers reporting their own dietary intake rather than their child's, children moving during body composition measurement, and resetting pedometers. Resource and program management were excellent. Most families met home-program requirements (83%). Preliminary intervention outcomes were encouraging for fathers and children.CONCLUSION:Program feasibility was demonstrated by excellent recruitment, attendance, acceptability, retention, program administration, and promising preliminary intervention outcomes. A few data collection difficulties were identified. A larger scale efficacy trial is warranted.

This study explored the impact of a university teacher education course on preservice and inservice teachers' attitudes towards gender equity in physical activity and sport. Preservice teachers (n = 40) completed an Implicit Association Test and explicit attitude measures pre-and post-course. Focus group interviews were conducted with preservice and inservice teachers (n = 24). Preservice teachers reduced their negative implicit and explicit attitudes towards girls and activity. Preservice and inservice teachers also improved their awareness and gained skills to address gender-related issues in schools. Targeted teacher education courses have the potential to improve gender equity in schools. (c) 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Parents have a major influence on the physical activity levels of their children. This influence operates through a host of mechanisms, including their own behaviors, attitudinal disposition, and parenting practices. Given the global issue of physical inactivity in both children and adults, the number of studies evaluating the impact of family-based interventions to improve children's physical activity levels has been increasing significantly. The challenge of engaging fathers has also been reported in other fields of pediatric research including psychology, chronic illness treatment, adolescent drug prevention, and parenting programs in general. To better understand how fathers contribute to their children's physical activity behavior, it is important to appreciate the varied roles that fathers may assume within families. Positive father involvement enhances children's growth and development through both direct and indirect mechanisms. Importantly, the suggestion that positive fathering and masculinity are independent constructs does not minimize the reality that fathers have a major influence on their children.

Despite rising mental health problems worldwide, engaging men to seek mental health support is challenging. Male-only lifestyle interventions have shown promise for improving men's physical health, but the overall impact of these programs on psychological outcomes is unclear. This review aimed to evaluate the impact of male-only lifestyle interventions on men's mental health and to identify if any study or intervention features were associated with effectiveness. A systematic literature search with no date restrictions was conducted across four databases and returned 15 946 citations. Nine studies were eligible for inclusion, representing 1427 participants. Risk of bias was generally low across studies, although none were specifically powered to detect changes in mental health. Overall, significant group-by-time effects were reported for 26% of mental health outcomes examined. In the fixed-effects meta-analyses, small-to-medium intervention effects were observed for mental health-related quality of life (SMD = 0.24), self-esteem (SMD = 0.51), and positive affect (SMD = 0.58). Insights into effective study or intervention features were limited because of the low number of heterogeneous studies. Although male-only lifestyle interventions have improved men's mental health in some circumstances, studies that are specifically powered to detect long-term changes are urgently required, particularly in groups with pre-existing mental health concerns.

Introduction: Poor mental health in men is an increasing global health concern, but men are reluctant to participate in traditional mental health treatments. Male-only interventions targeting lifestyle behaviours (e.g., physical activity) have shown promise for improving men's physical health, but the impact of these programs on psychological outcomes has not been evaluated. This systematic review was conducted to examine the impact of male-only lifestyle behaviour change interventions on men's mental health.

Background:Existing strategies to increase girls' physical activity levels have seen limited success. Fathers may influence their children's physical activity, but often spend more time with their sons and rarely participate in family-based programs.Purpose:To test a novel program designed to increase the physical activity levels of fathers and their daughters.Methods:In a two-arm RCT, 115 fathers (29-53 years) and 153 daughters (4-12 years) were randomized to (i) the "Dads And Daughters Exercising and Empowered" (DADEE) program, or (ii) a wait-list control. The 8-week program included weekly educational and practical sessions plus home tasks. Assessments were at baseline, 2 months (postintervention), and 9 months. The primary outcomes were father-daughter physical activity levels (pedometry). Secondary outcomes included screen-time, daughters' fundamental movement skill proficiency (FMS: perceived and objective), and fathers' physical activity parenting practices.Results:Primary outcome data were obtained from 88% of daughters and 90% of fathers at 9 months. Intention-to-treat analyses revealed favorable group-by-time effects for physical activity in daughters (p = .02, d = 0.4) and fathers (p < .001, d = 0.7) at postintervention, which were maintained at 9 months. At postintervention and follow-up, significant effects (p < .05) were also identified for daughters' FMS competence (objective: d = 1.1-1.2; perceived: d = 0.4-0.6), a range of fathers' physical activity parenting practices (d = 0.3-0.8), and screen-time for daughters (d = 0.5-0.8) and fathers (d = 0.4-0.6, postintervention only). Program satisfaction and attendance were very high.Conclusions:This study provided the first experimental evidence that efforts to increase physical activity behavior in preadolescent girls would benefit from a meaningful engagement of fathers. Clinical Trial information: Australian New Zealand Clinical Trials Registry: ACTRN12615000022561.