The SPRING RESISTANCE FOLDING TRAMPOLINE allows healthy progressive exercise in the comfort of the home office or gym. Utilizing body weight gravity thrust and inertia this form of exercising modifies your body weight and takes the body through periods of weightlessness. By adding dumbells or weights to your routine you can progress to a more complete cardiovascular workout. Product Features All-steel frame construction Heavy-duty Polypropylene 38' rebounding surface Ground to surface height of 8' 250 lbs maximum weight capacity Some assembly required Folds to a compact size for easy storage and portablity Six detachable rubber-tipped support legs Safety pad included Ideal for those with back ligament or bone problems seeking to avoid 'impact' exercises and increase bone-mass