Why does the equipment in a fitness studio need electricity?

Is there a good reason the person using it can't produce the electricity via a small electrical generator? Why can't users of a fitness studio through their activity not produce enough electricity to run the electrics for the whole building? Or at least of the piece of equipment one is using?Why does the equipment in a fitness studio need electricity?This is less of an engineering question and more of an economics question. Most companies that build fitness equipment are not in the electronics industry. Thus it is much simpler for the firms to put out equipment that uses simple off the shelf components that plug into the wall. The circuitry and parts needed to do this are not ready to go in an easy to use fashion for a company that doesn't really do much electronics engineering. Someday these types of packages might become widely available and be put into just about everything. If/When that day comes I am sure they will be implemented into the treadmill. Right now such a system would add a large cost into the treadmill, which will partially offset the monetary gains made by supplying its own power. A lot of time and effort would need to go into this system, so it is not just the additional component costs that have to be added in. Remember workout equipment often times is beat on and shaken a lot, so the electronics would also have to be somewhat rugged. Also, thing about something like a treadmill, it takes quite a lot of power to turn the path beneath you. This means that the energy storage system would have to be massive. This again adds a lot to the cost.



So to sum it up, it comes down to the economics. It would cost a lot, have very little short term gain (extra expense of machines), would take much longer to produce due to the larger engineering problem, and would wind up being bigger and taking up more space in the gym.Why does the equipment in a fitness studio need electricity?I don't know.