Exercise Ball is one of the most popular home fitness equipmentﾒs in the world. A primary benefi of exercising with a bodyball is that the body responds to the instability of the ball to remain balanced, engaging many more muscles. Exercise Ball can be used for stretching, strength training and balance training in more versatile ways than any other fitness equipment. Exercise Ball suits for all ages and fitness levels. The Gymstick Active Exercise Ball is made of durable non-slip material. Includes: Exercise Ball (dia. 65cm), hand pump, exercise chart and link for online training.