This mini exercise ball (approximately 6-9" in diameter) is the creation of Pilates and Barre Master Trainer Leslee Bender. Allows you to work your abs in extension and flexion with a greater range of motion that a standard crunch. Great for targeting your upper abs, lower abs and side obliques. In addition to supporting your lower back, the Bender Ball can also be used for an alignment aid while working on the Booty Kicker barre – for example between the knees, thighs or ankles - or maintaining a hamstring curl. Also can be used an an instability tool for more advanced exercises. Holds up to 300 pounds.