Comment by taneq

Muscle usage between a bike and a scooter isn’t even close. The leg you’re pushing with isn’t the problem, it’s that you’re supporting your whole body weight on one bent leg while you’re pushing, and effectively doing a one legged half-squat every time you transition from coasting to pushing and back. Add in the additional rolling resistance from the tiny wheels and the lack of mechanical advantage from gearing and overall you have something that’s only modestly better than jogging except when you’re costing down hill.