This ropeless jump rope allows you to skip rope in limited space indoors and will not interrupt the flow of your workout routine by getting caught in your feet. You can input your height and weight into the device, and the LCD on one of the handheld units informs you of calories burned, jump repetitions, and exercise time, or the device has a "talking" mode that informs you of exercise progress. Part of the training regimen of professional boxers and Olympic wrestlers, jumping rope exercises your cardiovascular system while exerting less stress on knees than jogging, strengthens your arms and shoulders, and ten minutes of jumping rope can burn as many calories as running an eight minute mile. The handles of each unit have three 2 1/2-oz. re movable weight inserts, a snapping sound occurs with every jump to help you maintain proper jumping rhythm, and the unit comes with a workout DVD and bag for ease of travel.