Last week I went out for my 7-mile Sunday run and between the weather, my new playlist, and a general feeling of being strong, I ran an extra 2 miles. This Sunday, I thought I would shoot for a 10 mile run just to hit the double digits. Once I got to 10, I still felt good and decided to see if I could hack a half marathon, so I tagged on three more miles. I felt good afterwards and wasn't overly sore or tired. Today I feel great. I'm in the best shape of my life.