Several are credible: To get him or her to opt in a teen might need to be introduced to multiple sites, and parents should check out sites also. The cdc http://www.Cdc.Gov/family/kids/ american academy of pediatrics and american college of sports medicine are sites of credible information on fitness, nutrition, health. There are now more resources available through popular websites and apps; see if created by experts.
Answered 12/9/2013
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