Yesterday I didn't feel like running so I took my dog for her daily walk, then drove to Red Rocks Amphitheater to walk the stairs.  I did 10 complete laps which was 2.5 miles.  I walked as fast as I could, and was appropriately short of breath.  My Garmin GPS said I did 2000 feet of elevation gain, but that this was much easier than my usual effort.  (What do you know, Garmin.  It was hard.) And today my quads and calves are very sore.  Which means I'll have to try this again sometime before winter snows set in.
     It was crowded with tourists.  Employees were setting up for the evening rock concert doing sound checks, playing music, so it was actually pretty interesting.