Exercise Ball - Professional Grade Anti-Burst Fitness, Balance Ball for Pilates, Yoga, Birthing, Stability Gym Workout Training and Physical TherapyPROFESSIONAL GRADE exercise balance ball. The ProBody Pilates ball is intended for core strength, balance, back rehabilitation and for toning and sculpting the upper body. The large balls are also used to aid pregnant women in delivery. INCLUDES ACCESS TO STABILITY BALL EXERCISES. The Swiss ball helps to focus on thighs, butt, ab workouts, pelvic floor, balancing, and other specific muscle targets and aerobic exercises. Use big sizes to remain active