Well, long for me anyways.
I went for a 5 mile run this morning. I decided to wear my heart monitor and let my heart rate dictate my pace. I started out at what felt like a pretty easy pace - about 10:30. I made it about 2 miles before my Garmin started alerting me to slow down. I cut my pace back to about 11, then to 11:30, and so on for the rest of the run. By mile 4.5, I was running so slow that I think I could have been past by walkers. My pace was about 14 - 14:20. Overall, my average pace for the run was 12:37. I was really surprised by how slow I needed to go to keep my heart rate in the aerobic training zone.
Here's my heart rate chart for the run:
Zone 3 is my aerobic training zone. Garmin reported an average heart rate right at 3.5, right in the middle of zone 3.
I feel alot different after this run that I usually feel after my long runs. I feel like I exercised, but I don't feel as beat down as usual. I feel pretty good.
I also found that I lost about 2.5lbs of weight during the run. Time to go drink some water!