6 Reasons Why Do I Stiffen Up After Exercise?

Exercise often causes muscle stiffness.

A healthy lifestyle requires exercise. It strengthens bones, muscles, and the heart and lungs.

This happens often when trying new exercises. This may require a new muscle. 

During or after exercise, muscles may feel stiff, tight, or aching.

As this happens, muscles repair and strengthen.

Muscle pain may start 12–24 hours after exercise. 

Twists, falls, and sudden blows can cause acute injuries. Sprains and strains are acute injuries.

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