Activity helps: anyone can start building muscle mass with a throughtful, appropriate workout plan. Building cardiovascular fitness is even more important (and useful for long term health). Muscle mass will start showing up if a teen has appropriate levels of testosterone (hair on face & body, perhaps history of acne, deepening voice). Muscle mass can start showing up in weeks
Answered 6/30/2014
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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