burn calories and save energy

How nobody thought of that before!
Hong Kong's branch of California Fitness, a fitness chain with many gyms across Asia (including Singapore) is testing an innovative concept: their cardio machines, such as stationary bikes, steps, and cross-training, have been equipped so that energy burned off by people doing exercise is transformed into electricity.
The brainchild of inventor Lucien Gambarota, the project is appropriately called "Powered by You". The goal is to make California Fitness more energy efficient, with the capability to produce and store energy. See video on YouTube here. (via inhabitat)