1. Lying on your back on a swiss ball, feet shoulder width apart. 2. Overlap your hands and extend your arms straight backwards like a diver. 3. Crunch up using your abs until you are about 4-inches ...
THE exercise ball, also known as a stability or Swiss ball, has become a staple in modern gyms and home workouts. Originally developed in the 1960s for physical therapy, the Swiss ball gained ...