The AirRep Baseball System is the ultimate rep training device for baseball. It allows for both individual and coach-controlled training all in the 12' X 12' space. ... The AirRep Tennis System is designed for individual training off court or on. It allows you to practice both backhand and forehand groundstrokes. The AirRep Softball System is the ultimate rep training device for baseball. It allows for both individual and coach-controlled training all in the 12' X 12' space.