I believe the dancing-on-the-pedals bit comes from the French expression: "monter en danseuse," i.e. "climb as a dancer." "Pédaler en danseuse" also can be used. I think the dancing motion has to do with the "dance" you have to do with the bike, sort of pushing it to one side while you're standing on the other feet (of course that's not possible on the trainer). But the image may still help.



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