EX-U-Ropes are used by Jump Rope For Heart. Perfect for beginners or experienced jumpers who want the best. This is a light, thin, fast plastic rope that's super durable. With injection-molded handles designed for comfort and free spin. Jumping rope is such good exercise for your students. It helps develop hand-eye-foot coordination, build endurance, and tone and strengthen muscles. It's affordable and portable too. EX-U-Ropes are also great for speed jumping and a favorite with jump teams.