2 miles for today, an easy start. I typically run for 20 minutes at 5mph, so I thought I would up myself to 6mph to finish the 2 miles in the same time. Turns out 1mph makes a HUGE difference! My calves hurt, and, like I said, I have a nice little blister. It was hard to push myself to finish.
Lesson learned: don't push too hard too soon. I'll be going back to 5mph tomorrow.