7.2 miles around town

This morning I ran 7.2 miles. My goal was to run close to a 10:30 pace and to that end I looked at my iPhone GPS and walked a bit a different times during the run to slow my pace down. I ended up with an average pace of 10:20. Starting out I was sluggish and was glad I picked today to do a slower run but after about 3 miles things kicked into gear and I felt normal and had to start slowing down.

The average pace I want to beat for the marathon is 10:30, thus beating my last marathon time. I know I can run 20 miles under this pace. The question is can I keep it up for 6.2 more miles. Guess I'll find out soon enough.