The Bender Ball gives you an ab workout that’s up to 408% more effective than ordinary crunches. Now you can sculpt beautiful abs fast. The secret to great results is the Bender Method of Core Training, developed by master trainer Leslee Bender. Each of Leslee’s ab sculpting moves puts you in the perfect position for results. Combined with her effective method of selective stabilization, it cranks up the intensity and targets the muscles you want from all sides — your upper abs, the sides and those hard to reach lower abs.