The CanDo Inflatable Exercise Ball is ideal for home and gym workouts, physical therapy and birthing classes. It's also a great alternative for office or classroom seating. Improve coordination, balance, flexibility and posture, and practice active sitting. You can also use the exercise ball as an aid for vestibular movement and equilibrium therapy—or just for fun! Our inflatable exercise ball is made from durable, high-quality PVC vinyl. The ball is designed to support users up to 300 lbs. Under-inflate the ball for a softer, mushier feel. Fully inflate the ball for a firmer, bouncier feel. On the initial inflation, inflate the ball, wait 24 hours, and then add more air to fill the ball to its maximum size. Maintain stability during cardio, yoga, Pilates, prenatal and therapy workouts! The CanDo Inflatable Exercise Ball is made with a non-slip material that features ribbing for added security. Confidently sit on the ball, rest your back on the ball, or grip the ball with your hands or feet during use. Incorporate the CanDo Inflatable Exercise Ball into home workouts or gym workouts to build core strength. Utilize the ball in physical therapy to support healing, and in prenatal and birthing classes to promote balance. Substitute it as a desk chair at work or school to promote active sitting. Use it at home while watching TV to ease tension in the lower back. The CanDo Inflatable Exercise Ball is sold in eight sizes: blue, 30 cm (12 in.); yellow, 45 cm (18 in.); orange, 55 cm (22 in.); green, 65 cm (26 in.); red, 75 cm (30 in.); blue, 85 cm (34 in.); red, 95 cm (38 in.); blue, 105 cm (42 in.); orange, 120 cm (48 in.), and green, 150 cm (59 in.). Choose the size of the ball according to user height: the blue ball is for users under 4'6"; the yellow ball is for users 4'6" to 5'; the orange ball is for users 5' to 5'5"; the green ball is for users 5'6" to 6'2"; the red ball is for users 6'2" to 6'8"; the blue ball is for users 6'9" and above. Larger sizes—red (95 cm), blue (105 cm), orange (120 cm) and green (150 cm)—are also available. Air pumps are sold separately.