December 4, 2004 at 1:35 am #16868
You eliminate wind resistance, which makes it easier, but you also have less oxygen because you are indoor (sic), which makes it harder.
Ryan R. wrote:
I also wonder if the fact that the running surface is moving under you, possibly accounts for some greater efficiency?
From the point of physics it is not possible to say whether you are standing and the surface is moving or vice versa (isn’t the Earth moving ?).