Instead of focusing on the amount of jumps you did, let the Tangram Smart Jump Rope ($90) keep track. The sleek looking jump rope features 23 LEDs at the rope’s center that flashes your current jump count. To ensure smooth rotation, each handle has a ball bearing inside. This helps make the tracking highly precise, counting actual rotations instead of estimates that an accelerometer would normally provide. One full charge will give you 30 days of use if you used it for one hour a day. The Tangram Smart Jump Rope comes in black, chrome, gold, and the option to cover it with a variety of colorful silicone grips.