Wait a minute...

180+ rpm? Are we sure about the "rpm" part?

180 rpm would be putting one foot -- say, the left foot -- through three revolutions per second. Those of you who were in marching band would realize that this would be like marching at a tempo of 360 beats per minute, or six footfalls (left-right-left-right-left-right) per second.

I just want to be sure what we're talking about here.