Everlast 65 Centimeter Burst Resistant Fitness Ball With Pump Tone, trim and tighten abdominal, lower back and leg muscles Keep your entire body in shape with Everlast's Burst-Resistant Fitness Ball and accompanying 20 minute exercise DVD Target all the major muscle groups, including glutes, obliques, abs, and quads Cushions your body Two-Way Action Pump makes inflating faster