BOSU ® name is an abbreviation of the words "Both Sides Utilised," which refers to the versatile application possibilities. BOSU ® is suitable for both group training, fitness and rehabilitation and for use at home. Balance and Coordination is the foundation for developing strength in all our daily movements and BOSU ® Ballast Ball Pro is the perfect tool to practice this in a effective and fun way. Now you have the opportunity to use the gym balls functional balance of properties without having to chase it around the training room! The ball contains an aggregate consisting of small balls with a total weight of 2.7 kg. Besides the ball staying where you put it, you can also use the ball's weight for resistance training. BOSU ® Ballast Ball can pumped up to between 55 cm and 65 cm.