muscles work in 'antagonistic muscle pairs'. One muscle of the pair contracts to move the body part, the other muscle in the pair then contracts to return the body part back to the original position.

An example of antagonist muscle pairs are the quad and hamstring, or the bicep and tricep. Yielding isometrics are especially useful in early and mid-stage rehabilitation of injuries. Overcoming ...

Muscles are attached to bones by tendons. Muscles contract to move our bones by pulling on them. However, muscles can only pull; they cannot push. This is why they usually work a joint in pairs.