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    Rowing machine?

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      Yeah, but I don’t have room for one in my apartment. I’m doing everything I can to avoid joining a gym because I know I’d never go.

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      How much acceleration do you need to trigger it? If your bike is a road bike (no suspension), get the thinnest tires your wheels support, pump them to the highest PSI the tires support, and go ride some streets. You’ll get bounced round quite a bit.