If you're the type of person who thinks working out is just a waste of energy, then a new gym developed in the UK might help change your mind.
This new fitness center, situated in a city park in Hull, northeast England, not only provides a facility for local residents to get fit but also generates electricity every time the equipment is used.
"So far, the community has generated 40,000 watt hours (40 kilowatts)," says Georgie Delaney, creative director at The Great Outdoor Gym Company.
"The goal is that a gym like this should serve a community of about 5,000 people and really people could easily make a kilowatt hour per day. So, if you times that by the amount of gyms that we could possibly install, that actually becomes quite a significant amount of energy," Delaney said.