Boost your cardiovascular performances with the Venum "Competitor" Speed Jump Rope! You will be able to perform intense workouts and activate a high "burn rate" of up to 700 calories per hour of dynamic activity, with at the minimum 0.1 calories consumed per jump! We engineered it for a strength training and a total body conditioning by adding fast changing weights (150 grs and 250 grs) for a customized and gradual increase. Their high quality ball bearing allows a fast, smooth and high amplitude movements in order to improve your coordination, agility and footwork. Its no-slip grip with ultra-soft foam will ensure you the ultimate comfort sparing you minor injuries at the hands and tensions at the upper arms. You work more, you get more! FEATURES: Engineered it for a strength training, and total body conditioning Fast changing weights (150 grs and 250 grs) for a customized and gradual increase High quality ball bearing allows a fast, smooth and high amplitude movements No-slip grip with ultra-soft foam for ultimate comfort