This study from University of South Australia shows that extra sleep may help children improve physical health as much as exercise.
While exercise has a greater and faster impact on physical health and wellbeing, children may be able to achieve the same 7.4% reduction in body mass index (BMI) by either:
exercising 17 more minutes (moderate-to-vigorous exercise) OR
sleeping an extra 52 minutes OR
reducing their sitting or sedentary time by an extra 56 minutes.