What happens if I use certain muscles more than others?

When certain muscles or groups of muscles are used more frequently (at work, play or during sports), they get stronger, larger and tighter. At the same time, the underutilized opposing muscles will be, by comparison, weaker and smaller. The eventual consequence could be that the joint/s will be in an abnormal position and slightly out of alignment. This is often very noticeable in the muscle development of tennis and baseball players.

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