If you live in Portland, OR, and want to improve your carbon footprint while getting/staying in shape, then take a look at The Green Microgym. In a nutshell, Green Microgym (TGM) offers an environmentally-conscious gym experience.
The actual neat details include the fact that the exercise machines are hooked up to the building’s energy grid, and your workouts actually help to power the lights and other electricity needs. TGM estimates that their carbon footprint is less than half if they were run as a regular gym.
Another nice benefit is that for every hour you workout, you get a $1 credit towards their store. Workout for 10 hours and you get a 50% off coupon at a local adidas store.
They’re franchising, so you can grab your own TGM for your town.