Jumping rope requires quick reflexes, good timing and coordination. It develops all of these skills, which can help you improve athletically. Jumping rope is also an effective aerobic activity that burns up to 744 calories in a 155 pound person after 60 minutes. The exercise engages your entire body but targets the calves and core muscles especially. Jumping rope also works the forearm and shoulders intensely as well since these are the muscles used to hold and turn the rope. The quads are involved as well since your knees work as shock absorbers for each jump. Your aim when jumping rope should be to create a steady, uninterrupted rhythm of jumping for several minutes at a time. If you increase the pace of your jumps, adapt your breathing pattern as well.