Saving the planet has become good business. Califonia Fitness in Hong Kong is trying to help making the gym more environmental friendly. The gym's "Powered By You" program is in an experimental stage and it is aimming to turn energy that goes into burning calories into real energy that can be used to power the gym. With the gym's modified cardio machine, one person on a cycle can generate up to 50 watt-hours of energy per hour. That's 4,380 liters of CO2 saved from our delicate atmosphere.