In a world that's always looking for the latest gadget, boxers know nothing beats a simple jump rope. The greatest names in boxing have always spent time rope skipping. Might not be that interesting if you're not a fan of boxing, but as somebody who jumps rope 3-4 times a week, I thought it was pretty cool. I can personally attest that the jump rope is invaluable for developing footwork, endurance, coordination, and quickness.