Smart Self-Guided Stability Ball STABILITY BALL: This self-guided stability exercise ball is a classic and versatile piece of gym equipment that is a must-have in any home, gym or even the office! EXERCISES PRINTED ON BALL: For easy reference, 13 exercises are printed right on the exercise ball, making it a great equipment choice for both beginners and those more advanced. VERSATILE: This stability ball can be used for general exercises, but also for yoga, pilates, as an office ball chair and much more. Its a versatile piece of exercise equipment for both home, the gym and even the office! DURABLE, BURST RESISTANT CONSTRUCTION: With burst-resistant PVC construction, this exercise stability ball is durable and high-quality, ensuring it will last countless workouts. Includes a pump for easy inflation. THREE SIZES AVAILABLE: Three sizes of exercise balls are available based on user height. 54 and under: 55cm, 55  60: 65cm and 61 and over: 75 cm.