Great training the last three days!

Thursday I did a 35 minute heart rate workout on the treadmill. I worked up to a maximum intensity of 5:41/mile at a 5 degree incline - equivalent to about a 4:30 mile pace effort on a track. I was very comfortable with my heart rate at 155 bpm.

Friday I went to the track and did a 40 minute heart rate workout at my highest intensity since I started training seriously this summer. My average heart rate was 150 bpm. I kept my heart rate between 155 and 160 bpm for the last 10 minutes. I feel like my threshold heart rate is now close to 160 bpm.

Today I went to the track and did a 30 minute heart rate workout. My average heart rate was 148 bpm. I felt comfortable with my heart rate in the high 150s. I then ran 5 x 300 meters allowing my heart rate to drop to 120 bpm after each 300.

My times were 0:57, 0:56, 0:55, 0:54, 0:55.

This is the first time I have averaged a sub-5 minute pace mile with my 300 meter repeats.  My heart rate was 164 bpm after the first 300 and 160-161 after the next 4 repeats. I am not sure why my heart rate went so high after the first 300. The five 300 meter repeats took a total of 12 minutes with an average heart rate of 148 bpm.