Crazy Idea

Hi, all this week, I would like to introduce you to one my crazy ideas. This is the idea of new energy concept. Most of us, when we go to gym, we will
do some aerobics. I mean operate a bicycle or elliptical cross trainer or a step mill    or pull/push something. Consider this, what if all of that could be transmitted to a rotary motion which will rotate a core in the generator/alternator which produces electricity.
The gym, where I go is not that crowded. Imagine all of the energy from a crowded gym is converted into electricity.
I am not saying it is capable of lighting some homes. But you can use this electricity towards air conditioning/lighting of the gym which can save its operating costs.