The other day, I realized that there is a running treadmill and a swimming treadmill, but I have never heard of a bike riding on a treadmill. Part of me thinks that, because you would not be moving relative to the ground the treadmill is on, you would fall over. The other part says that, because you would be moving relative to the belt on the machine, you would be able to stay up. This is kind of like that Mythbusters question about the airplane taking off from a moving thing.
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