Tumbl Trak Fitness Wheel The 5' Fitness Wheel features a poly bed with two individually inflated rings Velcro squares Interior Handles and D -Rings add to functionality Sets up in 5 different configurations Not intended to be used as a trampoline Designed for use under the supervision of a trained professional The 5' Fitness Wheel features a poly bed with two individually inflated rings Velcro squares Interior Handles and D-Rings add to functionality Sets up in 5 different configurations Not intended to be used as a trampoline