They're the ultimate in core training, the key to increased muscle isolation, improved balance, greater dexterity, and enhanced strength. Swiss balls--colorful balls that come in various sizes to suit different bodies and routines--are today's hottest workout trend, and here's the complete guide to the phenomenon. Packed with more than 300 color photos, Swiss Ball shows each routine from a variety of angles with concise captions that describe exactly how to perform each one for maximum results. General information covers choosing the right ball gentle warm ups and exercises for each area of the body, plus cardiovascular routines.