Rebounding with Kangoo Jumps provides a quick and easy aerobic effect to the body, especially the heart. Rebounding could practically be described as a “heart exercise”, since in using Kangoo Jumps your legs are the primary limbs physically active. It is easier on the heart to exercise the legs than the arms. Your heart has to work 250 % harder to pump the same amount of blood through your arms as it does to pump it through your legs. This is why people die while shovelling snow in Wintertime or playing tennis. Their arm movements are placing a tremendous burden on the heart muscle to deliver the oxygen and nutrients in the blood to the upper limb.