The EZ Up Inversion System includes the EZ Up Inversion Rack , Hang Ups Gravity Boots and an instructional video and book. Use the EZ Up Rack with the Gravity Boots to conduct inverted sit ups, squats, and rotational stretches. The EZ Up Rack features unique locking brackets and dual bars for easy mounting and dismounting. Gravity Boots provide an ankle conforming fit through two 'fine tuning' buckles with micro adjusting ratchets which fit the exact size and taper of your ankle.