This low-impact advanced training system combines a tightrope with the spring response of a trampoline, so you must constantly work to keep your center of gravity and stay balanced. Strap stretches across the bow like a string on an archery bow; increase or decrease the level of difficulty by adjusting the flexibility of the strap. Legs and adjustable rubber feet conform to floor to help prevent movement. Strap made of nylon webbing. 44" L x 2" W x 8" H. Yellow/Black. 14 lbs.