Even though my wakeup heart rate was 56 this morning, I was tired as I plodded through 2.5 miles. During the first mile, I followed Galloway's suggested ratio of running:walking of 30:30 (seconds). However, I could tell I was getting tired, and I changed to a 30:60 ratio. That helped. I should have made that change as soon as I realized I was tired.
Aside from being tired, it was a nice run on a beautiful day. The temperature was in the low 70s (F), but there was a 15 mph wind. During the first mile, I had to overcome the wind, and that probably helped me be tired. The main reason, I think, that I was tired was that I only got 5 hours sleep Saturday night. The lack of sleep was due to getting home late at night and having to get up early Sunday morning. I wore my wind breaker during the first mile, and I tied it around my waist for the remainder of the run.