By John Albers
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The exercise ball, also known as a stability ball, is a cheap all purpose fitness and exercise accessory that is gradually growing in popularity. It is a simple plastic ball filled with air. It is very resilient and capable of withstanding over five hundreds pounds of pressure before it breaks. Stability balls work on a principle quite the opposite of most fitness equipment and techniques; by providing an unstable surface to work on rather than a solid one, the muscles of the body immediately contract to maintain the body’s balance and stability. Over just a few short minutes these muscles experience a heavy workout simply trying to keep your balance as the person using the ball performs simple low-impact exercises. Thanks to its light weight, stability balls are much more portable and convenient than exercise machines, weight machines, and free weights. The balls were originally designed to focus on the strengthening of core muscles in the abdomen and lower torso, but with a little ingenuity they can be used to work almost every muscle group in the human body. This guide will explain how to perform thigh squeezes using a stability ball.