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The following recommendations were made: 1) Children and youth 5-17 years of age should accumulate an average of at least 60 minutes per day and up to several hours of at least moderate intensity physical activity. Some of the health benefits can be achieved through an average of 30 minutes per day. Level 2, Grade A. 2) More vigorous intensity activities should be incorporated or added when possible, including activities that strengthen muscle and bone Level 3, Grade B. 3) Aerobic activities should make up the majority of the physical activity. Muscle and bone strengthening activities should be incorporated on at least 3 days of the week Level 2, Grade A.
Janssen et al. (Fri,) studied this question.