gym ball exercises ball fully supports you so you can focus on your workout, whether you're using the physio ball to perform elevated push-ups or plank, back bends or bridges, or for help with proper positioning when holding the pilates ball with hands or ankles for slow sit-ups or core-enhancing crunches. stability ball rated up to 2000 lbs. fit ball has hand pump included, fitness ball exercises promotes strength, agility, and balance. ball can be blown up to desired size and firmness, but has a maximum diameter of approximately 65cm. Package includes 1 x gym ball.