Check out the GYM Electric concept car by Da Feng. It is a fully electric mobile workout center with a single seat and each workout charges the car for more driving. The vehicle was inspired by WWII fighter airplanes and is made from carbon-fibre and magnesium alloy.
The GYM concept car gives the exercising options of a stepping machine, rowing machine, bench press, pull-up simulator, or arm weights. But the best thing is that the GYM concept car gives the option to charge the car from inside the car.