Yes: Muscles contract or become tense when you exercise. There are 3 type of muscle contractions. Concentric = muscle length shortens as it contracts (when you do a biceps curl). Isometric=no change in muscle length (when you show off your biceps). Eccentric=muscle lengthens as it contracts (plyometric exercises such as a box jump) - best way to become stronger or treat muscle injury. Hope this helps.
Answered 9/29/2016
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