Ampersand Shops Balance Trainer Half Ball Yoga Fitness Exercise Workout Balance Trainer Ball is known as a versatile fitness device that helps increase strength, improved balance, enhanced flexibility, fine-tune sport skills. Using the Training Balance Trainer dome side up provides an ever-changing, unstable, dynamic surface while the device itself remains stable. Have fun and get fit all at once! Get yours now! Size: Ball Diam. 22.8"; Ball height 9" Maximum weight limit: 660 lbs.