Product 1. The jump rope is suitable for HIIT training/interval training/cross fitness/boxing/to increase weight loss, endurance and stamina. Jump rope exercise will work your shoulders, hips, entire back, hamstrings, triceps and forearms2. Heavy Duty Jump Rope - Designed with premium materials, the weighted jump rope comes with a pair of comfortable ergonomic non-slip handles to ensure an effective workout. This provides top-notch handling - soft, comfortable, natural and sweat-resistant. The weighted jump ropes are easy to use and have a system to adjust the length to your liking3. Ready-to-use weighted jump ropes for most people - Weighted jump ropes rotate slower than regular jump ropes due to the weight. Slow rotations provide proper jumping timing and help improve your upright posture, allowing your entire back and shoulder muscles to properly engage in the arc. Our weighted jump ropes for women are suitable for beginners and experts for most ages4. Power Your Upper Body, Especially Your Shoulders - Weighting the jump rope requires and develops upper body strength to keep rotating the rope for continuous jumps, so all of your back, shoulder and forearm muscles are engaged with each rotation. The shoulder muscles are responsible for controlling the entire movement and strengthen your shoulder muscles regardless of your fitness level