How to safely and effectively build muscle, whether for looks or for strength. Also, how muscles work physiologically.

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Why do you have to exercise to build muscle?

Many chemical processes that used to be time-consuming or tiresome can be worked around, e.g migraine, vitamin deficit, bad eye-sight. Endurance training and muscle anabolism are just chemical ...
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Muscular Atrophy in Senior Citizens

To what extent can a good exercise programme help to recover lost muscle in people over 70 who, while very fit and active, have not exercised regularly in earlier years?