Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights.
Repeated exercise, or wasting, can change the way key genes work.
13don MSN
What’s the Difference Between ‘Lean’ and ‘Bulk’ Muscle — and Which Should You Aim For?
The misconception that muscle can be lean or bulky lies in its appearance. “When people (say ‘lean’), they’re usually ...
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