The Journal of the American Medical Association published research that concluded that moderate to vigorous physical activity declines significantly from 9 to 15 years of age.    Nine years old participated in 3 hours of moderate to vigorous physical activity per day whereas 15 year old participated in 39-45 minutes per day.

Reference:  Philip R. Nader; Robert H. Bradley; Renate M. Houts; Susan L. McRitchie; Marion O'Brien Moderate-to-Vigorous Physical Activity From Ages 9 to 15 Years JAMA. 2008;300(3):295-305.

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