The weighted speed jump rope combines resistance and cardio training to develop upper body strength and physical endurance. Use a weighted jump rope to warm up muscles, for CrossFit double-unders, intense HIIT workouts and to improve coordination, agility, footwork, and quickness. The Lifeline Weighted Speed Rope features .75lb or 1.25lb weight in the rope and high-tech ball bearings for smooth rotation to provide effective weighted jump rope training.