Your core muscles are the muscles of your trunk or torso, including the abdominals, obliques, pelvis and back muscles. Your center of gravity resides in your core and every movement you make originates from here. Strong core muscles make it easier to do most physical activities. Core exercises ensure more stability that makes you less prone to muscle injuries and back pain. It protects against injury by firming the midsection.

A favorite tool for core exercises is the ball. Fitness experts concur that the ball is one of the best ways to strengthen the abs and back. Exercise balls put the body in an unstable position. In this situation, the legs and the abs immediately contract to keep from falling off. Add a crunch and you will feel the intensity of the movement.