Learn why excessive exercise causes muscles to become stiff and sore.
©Shutterstock, 2010 Stiff and sore muscles are not uncommon after a vigorous workout.
Excessive exercise causes muscles to become stiff and sore because if muscles are worked too hard, the cells run out of oxygen.
This starts a fermentation process which produces lactic acid. The build-up of lactic acid in the muscles causes soreness and stiffness.
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