What is the best way to gain muscle on your body?

Answer:
Weight training definitely. Do 3 sets for each muscle group.Lift every other day, like Mon. Wed. Fri.
Light, heavier, heaviest, and increase the weight each time. This gives them a nice shape too.

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swimming or weight machines

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you dont really gain muscle you increase its size if you take in more protein and of course lift weights also it helps if you reduce fat content in your body to make that simple make adipose cells(fat cells) smaller and increase your muscle size

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