Have you ever taken a spin class? Whether at home on a stationary bike or in a mirrored room filled with people, you know this form of exercise is going to be hard work. The initial pedaling feels like you’re moving the bike through thick mud. You apply so much effort to get the wheels spinning, pressing hard to catch up to the instructor’s speed. Then, once you get moving, the momentum propels the wheels to spin faster with less effort on your part (until the instructor changes the incline). ...
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