Why working out works

Muscles change in response to work they have done.

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Published: Fri 18 Sep 2015, 4:49 PM

>>Muscles work three ways
Contraction
Muscles shorten as they pull.
Isometric effort
Muscles hold loadwithout changing length.
Extension
Muscles pull and lengthen at the same time.

>>Muscles are constantly built, torn apart
Enzymes constantly break down old protein fibers in muscles and control the making of new ones.
Exercise, active lifestyleMore muscle is built than is broken down. Sedentary lifestyle, aging, poor nutrition More muscle is broken down than is built. All three types of movement make muscles grow larger, but isometric exercise does not promote muscle cell construction.