A jump rope is the most bang-for-your-buck piece of fitness gear you can buy. That simple string not only creates killer cardio but builds monster calves, one of the most notoriously difficult muscles ...

If you’re up for a challenge, the double under is the move for you. As you jump up, the goal is to swing the rope in two full ...

Fisher stepped out onto the ice, which cracked under his weight, armed only with two of his jump ... thickest ropes — 16-foot-long cloth ropes knotted at ends that he uses for double Dutch.