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Exactly, I couldn't keep that up for very long on the pavement! On a treadmill you just sort of bounce along like Mario.

I guess this is why it feels a little like cheating. I can run and run on a treadmill at a pretty quick pace, I don't know the mph but on about level 15-17 out of 20 and get very sweaty but I don't know if it actually making me much fitter.