I wonder how much more efficient the generation could be? 60Watts is still somewhat impressive in the rig mentioned, but I wonder if maybe better control of the rpms of the generator (through gearing) could give more efficient generation. I feel like at the gym, the workout bikes (which I think are generally powered by pedaling), will give you a wattage output that seemed higher than than 60 watts, but again, that's about resistance (and not taking into account the inefficiencies of power generation). Seems like it could be made usable for a daily power generation machine (reminds me of "Oxygen Not Included", where you have the person run on a hamster wheel to generate power).