By eHow Sports & Fitness Editor
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Physio balls, also known as Swiss balls or exercise balls, are most commonly used in physical therapy. However, they can also be used in part of your regular fitness routine. Physio balls are flexible and unstable, forcing your body to work a bit harder to keep your balance, engaging the muscles of your core. The physio ball shoulder exercise will strengthen the muscles of your upper body while working your core.
eHow Sports & Fitness Editor