Power-aid? Sweat Fuels Electricity at Gym

The company's literature says the dance floor is a movable surface composed of small modules. As people dance, the movement of the modules is converted into electricity that lights up the floor. An "energy meter" allows dancers to see the amount of energy they are creating.

Like the TVs and stereos in the gyms, this meter encourages participants to work harder to generate more energy.

Actor and environmentalist Ed Begley Jr. has been a long-standing fan of the human power. In 1990, he and a friend connected a bicycle to a 24-volt battery. On his cable reality show, "Living With Ed," airing on Planet Green TV, he has been known to make toast with energy created by pedaling his bicycle.

"I think as much human-powered exercise equipment as we can advance would be for the good," he told ABCNews.com. "I think that the idea of sitting on a life cycle and using power that is plugged into the wall ... is upside down." The Emmy Award-winning host of the eponymous educational television program "Bill Nye the Science Guy" also gives the technology a thumbs up but cautions that it's not free of problems.

While the amount of energy a human can generate is not insignificant, it still requires a lot of work. For example, Henry Works' Tagget said he estimates that the average user of his power-generating cycling machine can create 100 watts per hour, which could power a smaller television for about an hour and fifteen minutes.

Nye also said that questions regarding energy storage persist.

Still, he said, "The idea is great. You see people going to the gym now in droves and they ride their bikes to nowhere, and so wouldn't it be nice to capture all that energy?"

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