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The muscle myth debunked: Why "lean" vs. "bulk" is actually all in your head (and kitchen)
Forget what you’ve heard about "toning" vs. "building"—science proves all muscle is created equal, and your ultimate look ...
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.
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