KeywordsPhysical activity, School-based approaches, Physical education The paper by Beauchamp, Rhodes, and Nigg [1] sets out a bold goal and one which is worth investing in given our knowledge of the health benefits of physical activity in children. It proposes three actions to address the low levels of physical activity among children and the purported lack of success of school-based interventions in promoting meaningful levels of physical activity. It is aspirational, suggesting changes in legislation to extend the school day, to employ specialist physical education (PE) teachers in primary or elementary schools, and to mandate a minimum amount of PE that should occur in schools each week.I agree with the authors that researchers, practitioners, and policymakers need to work together to more effectively promote physical activity among students in elementary schools. I also agree that each component of the proposed Btripartite framework^is worth pursuing and provide some suggestions for consideration to further strengthen the authors' main points.First, there is good evidence that school-based interventions are effective. Whole-of-school programs are one of the B7 best investments for physical activity^pro-moted in the complementary document to support the Toronto Charter for Physical Activity: A Global Call for Action [2]. To be included, each investment needed to be supported by evidence and be applicable globally. The systematic review used by the authors to argue that school-based interventions have shown limited effectiveness [3] did not focus solely on the school day. Just over half the studies (17/30) were school-based and, despite this, the review did show that there was a statistically significant intervention effect for school-based interventions for moderate-to vigorous-intensity physical activity (MVPA) (standardized mean difference [95% CI] 0.17 [0.07-0.27]). In my opinion, this difference does provide an important health benefit given MVPA is the intensity of activity recommended in physical activity guidelines for school-aged children and that current rates of meeting physical activity guidelines in children is low internationally [4]. In addition, the Metcalf review did not include studies that only reported intervention effects for a component of the day, such as school hours. As such, the effect of school-based interventions was measured across the entire day, which can be misleading when determining their effectiveness given many of the school-based interventions only targeted the school day and had little to no control over activity levels outside this time. The Metcalf review does cite one study which did report an intervention effect specifically for the school day that was more than four times greater than that reported across the entire day (0.92 vs 0.21) [3]. Before taking up the authors' suggestion to Bsubstantively rethink how we promote school-based physical activity among children,^one should be confident that what is currently being done is not working and needs fixing. This woul...