Last night, I go to the Y, and all of the elliptical machines were taken. So I sign up for the next available one, and walk around the track for 20 minutes waiting for it to open up. I get on the machine I thought I signed up for and work out for about 15 minutes when a guy comes up to me and says he signed up for the machine I'm on. It turns out I was on an Arch Trainer instead of an Elliptical Machine. Does anyone know the difference? The only difference I was was that the base was different.