An environmentally conscious individual would truly value 'green' fitness.
It could be as simple as running/jogging out in the open and eating healthy, but when it is time to hit the gym, it is good to know there are some good eco-friendly solutions out there.
 
"SportsArt Fitness' revolutionary Green System is a "pod" of fitness products attached to an inverter that harnesses human energy from exercisers and feeds it back into the power grid as usable power. "
Lose weight and save money - nothing better!

Read more on their website.