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.

When you take a muscle through the full range of motion, it goes through three phases of muscle contraction: eccentric, isometric, and concentric. Placing more attention on one phase can yield ...

The benefit of isometric exercise is that it tends to strengthen your core more than traditional isotonic exercises (when your joints are moving). Isometrics also lend to more stability and tend to ...