Classroom physical activity breaks may increase student MVPA, but effectiveness in elementary schools appears to depend on implementation fidelity, administrative support, and equitable system-level infrastructure.
Implementation fidelity was low and highly variable but comparable between teacher-delivered and video-delivered classroom activity break conditions.
Classroom MVPA increased significantly in both intervention groups across one academic year.
There was no significant difference in MVPA outcomes between teacher-delivered and video-delivered classroom activity breaks.
The trial used a cluster randomized design to compare teacher-delivered versus video-delivered classroom activity breaks under real-world conditions across one academic year.
Low and variable implementation fidelity limited conclusions regarding the effectiveness of classroom activity breaks and highlighted the need for stronger implementation supports.
This research studied whether having teachers lead physical activity breaks in elementary school classrooms, compared to showing students activity videos, made a difference in how much moderate-to-vigorous physical activity (MVPA) students got during the school day. Eleven schools were randomly assigned to one of the two approaches for an entire school year, with teachers trained to lead two 10-minute activity breaks each day. The study tracked how often breaks were actually delivered using an online platform and measured student activity levels with accelerometers at the start and end of the year. The study found that both approaches led to meaningful increases in classroom physical activity — about 9 to 10 additional minutes of MVPA per day — and neither format was significantly better than the other. However, a major challenge was that teachers in both groups only delivered about half of the intended activity breaks, and there was wide variation in how consistently breaks were implemented across classrooms and schools. This low and inconsistent delivery made it difficult to draw firm conclusions about how well either approach truly works when implemented as intended. This research suggests that classroom activity breaks — whether led by teachers or delivered via video — have the potential to increase physical activity among elementary school students, but real-world results are heavily influenced by how consistently the breaks are actually carried out. Factors like school leadership support and having the right systems in place appear to matter greatly. Future efforts to bring activity breaks into schools may need to focus as much on supporting teachers and building school-wide infrastructure as on the format of the breaks themselves.
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Upload Your LabsSzabo-Reed A, Washburn R, Lee J, Gorczyca A, Honas J, Donnelly J. (2026). Teacher- Versus Video-Delivered Classroom Activity Breaks and Student Physical Activity: The PAAC-3 Trial.. The Journal of school health. https://doi.org/10.1111/josh.70225