Someday it may be possible to have dual-function workouts where your jump rope (powered by you for 20 minutes) recharges two AA batteries and keeps you fit simultaneously.

On June 18, Yanko Design (YD), an international design blog, showcased inventor Kyung Guk Lee's design concept  that does exactly that, enter the E-rope a whole new meaning of green fitness.

Green fitness like how the American actor and environmentalist Ed Begley Jr. rides a stationary bike to feed energy to his toaster to make breakfast.

You could sort of do the same; the batteries are somehow powered via kinetic energy as you jump thru the handles that store a battery on each side.

Watch the concept of E-rope harnessing "human power":