Introduction: Time-efficient physical activity interventions are needed for older adolescents (≥16 years) in the senior school years (i.e., Grades 11 and 12) where there is a heavy focus on academic performance and physical education is not mandatory. The aim of our study was to evaluate the impact of a time-efficient school-based intervention designed to improve older adolescents’ cardiorespiratory fitness (CRF) by integrating high-intensity activity breaks into curriculum time.
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