If you’re both an alternative energy geek and a hopeless gym rat, get ready for a healthy dose of awesome. Coventry University design student Da Feng has envisioned the GYM concept car, a stealthy one-seater with a rather interesting power system. When parked, the GYM’s cockpit turns into, well, a gym. It features a rowing machine, a bench press system and a stepping machine– all of which transduce the kinetic energy of a workout into electrical energy that charges your battery. On the exterior, the styling of the GYM concept is one half Stealth Fighter and one half Formula One racer. While we certainly dig this concept, we can’t necessarily call the GYM ground-breaking– as we’ve heard of the exercise-into-motion machine concept elsewhere. It’s called a bicycle. Ho!