Yes: It is a great disappointment to many early teens that they don't develop lots of muscle mass. While some is genetic, some is conditioning, it is not unusual for young teens to delay real muscle development until later into the teen years and beyond.
Answered 11/15/2015
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A doctor has provided 1 answer
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A doctor has provided 1 answer
A doctor has provided 1 answer
4 doctors weighed in across 2 answers
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