Human exercise equipments that actually consume electricity during their normal operation such as electronic stationary bicycles, stair climbers, rowing machines, treadmills, and as many other kinds of exercise machines as possible should be designed with the ability to generate their required electrical needs directly from the human energy exerted on such machines so as to make such machines energy neutral, thus not requiring any external power inputs. At least these machines should have the ability to state how much electrical energy is being produced so that users would gain a better perspective on just how much physical energy they could produce and just how much effort is required to produce 100 watts of electricity, for example.