Overweight and obesity is increasing at an alarming pace in North American adults, and at an even faster pace in children and adolescents. Obese children are likely to maintain unhealthy weight into adulthood which increases their risk for chronic disease development. Not only does the obesity epidemic impact health and quality of life but the consequences pose a huge economic burden to our healthcare system. Exercise is important to physical health and well-being. But what is the type and duration of exercise we should be recommending to children? Short-duration physical activity programs and policies have been implemented across North America as a means to benefit energy balance without reported evaluation of the benefits of these programs. The primary objective of this research was to investigate the relationship between duration of acute exercise at the ventilation threshold on subjective appetite and short-term food intake in children and adolescents.