Back in the day... Ha... When I was traveling to frequent conferences I found my body rejecting the common stationary bicycles I found the the hotel gyms. It seemed they gave me bad habits that resulted in muscle memory loss for when I returned to ridding. For me stationary ridding on a strange machine was just not right. When doing the elliptical machines though I found I could get a reasonable workout with a fast recovery time. Much like cycling. So when I was traveling I made almost exclusive use of the ellipticals.
When I was in areas without a gym I usually found stairs. Yep... Up those stairs then ride the elevator down and up again. In those days I was just beginning to loose my down so it was up all the way...
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No matter where you're at... There you are... Δf:=f(1/2)-f(-1/2)