This popular full-body workout is a series of movements designed to improve flexibility, balance and coordination. It also strengthens crucial muscles in your stomach, lower back and hips. Named for Joseph Pilates (1883-1967), the German physical trainer who invented it, the dynamic system can be performed on an exercise mat at home or at a studio with special equipment. Focusing on precision and control, concentration and breathing, it results in longer, leaner, more sculpted muscles as well as improved flexibility and posture.