To nap or walk?

I live behind a computer, or in a car, or in a meeting. My life has the movement I put on it, which is to say, almost nothing. I sat. That will be the headstone on my gravestone. Here lies Mojoey. He sat. Yep. That's me. 

While riding home today after another day of sitting, my mind was occupied with napping. I just wanted to put my head on a pillow for an hour and sleep. Napping is what I do when not sitting.

I got on the treadmill instead. I selected hill climbing from the menu and for the next 25 minutes walked like a demon in an effort to keep my feet under me. When done, I was (and still am) drenched in sweat and out of breath. I don't feel a need to nap now. I don't even feel tired. I feel good. 

I'm thinking of adopting a new habit. I'll hit the treadmill for 20 minutes when I walk through the door, and perhaps in the morning before I walk out the door. That's 40 extra minutes of exercise a day and a bunch of calories burned too. 

I burned 425 calories on my hill climb. I wonder what a nap would have got me?