None, If...: Properly trained, instructed, and supervised; none. Unsupervised, max lifts, overuse; muscle/tendon injuries, slipped growth plates, damaged grwoth plates, etc.
Answered 11/26/2013
5.9k views
Yes: Growth plate damage. Isotonic exercises are best at this age(using his own body weight).
Answered 9/28/2016
5.9k views
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