I started my run about 11 am this morning. The temperature was 25 (F) last night, and the air was still cold during my run, even though the temperature in the sun was 50 (F). I was glad I wore my nylon windbreaker. There were a number of runners and walkers on the path, and it was a beautiful day.
My wakeup heart rate was 59 this morning. I felt fine during most of the run, but I started to run out of energy during that last half-mile.