The back consists of large, complex muscles that support your trunk and spine. There are many types of back muscles, and they are all essential, helping you walk, bend, twist, and hold your body ...
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.
11don MSN
What’s the difference between ‘lean’ and ‘bulk’ muscle — and which should you aim for?
There's a lot of talk about lean muscle compared to bulk muscle, but experts say it's not worth differentiating the two.
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