I ran intervals this morning. After a warm up, I ran 400m fast, then 400 m slow, then 400 m fast, etcs. I did 6 rounds of that, and was pleased that I managed to run the 6th just about as fast as I ran the 1st. (No, neither one was exactly World Record pace.) It was a good workout, and I probably burned off about 1% of the calories I've consumed in the form of tiny little candy bars in the last 24 hours.