Cordless Jump Rope

In 2002 Lester Clancy patented an exercise apparatus that “simulates the effects of jumping rope, but does not utilize an actual rope.”

“To use the invention, a user holds a handle in each hand, and begins to simulate jumping rope while moving the handles in a circle with their hands and arms. The weighted ball or gear simulates the centrifugal action of a jump rope, thus delivering all the health benefits of jumping rope without any of the disadvantages of stumbling on the rope, having the rope hit the ceiling or the like.”

Another workout: Mail one handle to a partner in Japan and you can have an 8,000-mile tug of war.