Exercise ball is one of the most popular home fitness equipment in the world. The effectiveness of ball exercise is based on the fact that working on an unstable platform activates more muscles. The exercise ball can be used for stretching, strength training and balance training in more ways than any other tool. The exercise ball is suitable for all ages, regardless of physical condition. The Gymstick ball is made of durable and non-slip material. Available in three different sizes: 55, 65 and 75cm.