The BOSU ball Integrated Balance Trainer is a truly unique balance, core stability and proprioception training device that can be integrated with all types of fitness training, or stand alone as an outstanding functional tool.;The BOSU Balance Trainer can be used for or with: Sports Conditioning (both aerobic and anaerobic) - Stabilization, Agility Training - Strength, Stability and Flexibility Training for the Trunk - Strength for the Entire Body.