Help to isolate specific muscle groups while training. Improves balance and coordination. Gripping ridges provide extra traction. Heavy construction with a durable non slip surface. Great for relieving tension and stress. Exercise course included - describes over 7 easy to do exercises. Strengthens, tones and stretches the entire body. Perfect for all ages and fitness levels. This Body Ball enhances strength and endurance by helping you isolate specific muscle groups during training. This Body Ball also Increases balance and coordination as you incorporate it into your weight training, aerobic and resistance workouts. This Body Ball has gripping ridges that provide excellent traction.