Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights.

The flow of water within a muscle fiber may dictate how quickly muscle can contract, according to a new study. The flow of water within a muscle fiber may dictate how quickly muscle can contract, ...

The calf muscles, comprising the gastrocnemius and soleus, are often referred to as the body’s “second heart” because of their critical role in promoting blood circulation. Every time we walk, stand, ...