A jump rope, rope skipping, skipping rope or skip rope is the primary tool used in the game of skipping played by children and many adults, where one or more participants jump over a spinning rope so that it passes under their feet and over their heads. Jumping rope is an activity not only suited for competition or recreation, but also for a cardiovascular workout, similar to jogging or bicycle riding. This aerobic exercise can achieve a "burn rate" of up to 1300 calories per hour of vigorous activity, with about 0.1 calories consumed per jump. Ten minutes of jumping rope can roughly be considered the equivalent of running an eight-minute mile. Since the impact of each jump or step is absorbed by both legs, jump rope may have lower risks for knee damage than running.