A BOSU fitness class is a workout that incorporates the use of a BOSU ball, which is a half-sphere shaped piece of fitness equipment with a flat platform on one side and a rubber dome on the other. In a BOSU fitness class, participants perform a variety of exercises that challenge their balance, stability, and coordination by using the unstable surface of the BOSU ball. BOSU classes can be adapted to different fitness levels, making them suitable for beginners as well as advanced athletes looking to improve their functional fitness.