10 minutes calisthenics and dumbbell slinging in the control room.
Not much, because I don't want to sweat it up too much right now.

Later at home...
Elliptical 30 minutes 12.5 degree incline. Heart rate 155.
Started out at resistance 5, but that didn't work. Lungs began to burn and I could feel lactic acid burn in my quads. No way I was gonna last 30 min like that. So after 5 min and 1/2 mile, I cut resistance to 3. The last half mile (5 min), I set resistance to 6.

I bet you didn't know that Scott Joplin's Maple Leaf Rag is a great cardio tune. Not as good as Alice in Chains' Fear the Voices, but still... Not bad at all for a good cadence.