Our Training Ball is a safe, versatile, and exciting way to improve overall fitness. Enhances strength and endurance by helping you isolate specific muscle groups during training. Increases balance and coordination as you incorporate it into your weight training, aerobic and resistance workouts. Is Anti-Burst, and can withstand 750 lbs. of pressure. Stays round during use. Has gripping ridges that provide excellent traction. 55cm in diameter for people who are 5'1" -5'6" in height.