Best Speed Jump Rope for Endurance Training and Fat Burning - Easy Adjustable This crossfit jump rope will increase fitness and stamina, keep you trim and improve energy levels. Cross training for fitness with this simple workout tool is essential to help support higher activity level and avoid injury in other sports. Sturdy nylon construction and fully adjustable so any man, woman or child can use with ease. Jumping rope burns up to 400 calories per 30 minutes so you can look good, feel good, increase stamina and get more out of every day. Best jump rope for cardio boxing, MMA training and weight loss. Will get you in shape and ready for any event fast!