Why not harness Gym energy?

Question

Why not make machines through which workout is converted to electricity and enters the grid?It seems it will help balance the renewable energy on grid.

the_hoser · Accepted Answer

Humans don't produce a lot of usable energy that way. Let's say you burn 300 Cal riding that stationary bike for 30 minutes. That's barely 0.3 kWh. Most of that energy you burned is just heat. The rest is minuscule. After subtracting inefficiencies of the alternator, and transformers, and all the rest of the hardware required to convert human power into electrical power... you're not left with much. It would take far, far longer than the lifespan of the exercise equipment to pay for the operation.And, most modern cardio equipment consumes more energy as electricity than the user of the equipment is producing.

jetti · Answer

There is a gym chain in the Chicago named Eco Gym[0] that uses solar and human power to power their gyms.[0] https://www.ecogymworldwide.com/

bvandewalle · Answer

Because we are talking about a negligible amount of energy.It would take more energy to build, install and maintain the equipment that would be able to do that.

smarri · Answer

I've always wondered why we can't do more with the kinetic energy of the ocean. I know there are many projects and tidal energy companies. But considering the scale of the ocean, waves, and so on, I've always been interested to know why we haven't cracked it at a large scale.

Why not harness Gym energy?

Why not make machines through which workout is converted to electricity and enters the grid?
It seems it will help balance the renewable energy on grid.

There is a gym chain in the Chicago named Eco Gym[0] that uses solar and human power to power their gyms.
[0] https://www.ecogymworldwide.com/

Because we are talking about a negligible amount of energy.
It would take more energy to build, install and maintain the equipment that would be able to do that.

I've always wondered why we can't do more with the kinetic energy of the ocean. I know there are many projects and tidal energy companies. But considering the scale of the ocean, waves, and so on, I've always been interested to know why we haven't cracked it at a large scale.