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I'd have to look closely but you can pump a bike without engaging the drive train. It's a bmx thing where you amplify the momentum with downward pressure. This is way outside my knowledge base but pump tracks are a thing. I assume you (if your name is Danny McCaskill) can do this backwards as well as forwards.
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If you would only recognize that life is hard, things would be so much easier for you.
- Louis D. Brandeis
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