Recumbents rule. I just biked 44 miles, and while I'm tired, I have no noticable joint pain of any kind. Next time, though, I need to remember sunblock. And the visor for my helmet. And some snacks.
I don't know this for sure, but my research indicated that it wasn't physically possible to burn as many calories per minute running as riding: I could get up into the 1200 calories per hour range on a bike if I were willing to be stupid.
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