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Old 11-04-12, 12:00 PM
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GeorgeBMac
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Originally Posted by billydonn
Worth noting: Lots of people riding in a room that isn't well ventilated can not only heat the room, it can lower the O2 level in the room. IMO it is also nicer when a spin class is led by someone who actually rides a bike. Anyway, good luck with it. Indoor riding can really be valuable and productive stuff.
You talkin' about methane?
... I know some people who seem able to "lower the O2 level" singlehandedly...
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