<DIV>Because it's so effective and easy to use even at home, the Swiss ball has rapidly become an essential part of a total fitness regime-especially in tandem with free weights and a medicine ball. These exercises will help you utilize its full potential for building core strength and more, because they also work the muscles in the midsection, chest, back, shoulders, arms, and legs. The wide-ranging routines go from beginner to advanced. <br></DIV>