Hiking 40:00 
Did some hiking at the MSP airport while waiting for my 2-hour-delayed plane to arrive from Newark, NJ so I could fly to Columbus, OH for work. Unfortunately it's a quick trip - flying home Tuesday night - so less than 20 hours on the ground no time for adventure.
Found some stairs where the B concourse goes underground and rocked them until I started sweating. Then thought better of getting nasty and gross and then sitting on a plane for 2.5 hours in close confines with an unknown neighbor and stuck to easier walking.