The BOSU Balance Trainer is a versatile piece of equipment that is ideal for static and dynamic balance training. It can also be used to integrate balance challenges into cardiovascular, muscular strength and endurance, core and flexibility training. The BOSU can be used with the platform side either up or down to challenge balance with different body positions; hence the name BOSU (BOth Sides Up). 24.6" wide. 19 lbs. BOSU Balance Trainer also includes a pump, plug, and Total Body Workout DVD.