A good effort but the clock doesn't lie

Today's run (street): 4.3 miles

I had an early appointment that delayed today's run until mid-morning. The temperature at 10:00 AM was a reasonable 77°, but the sun was making it feel warmer than that. My plan was to go out fast and maintain the speediest pace I could, for as long as I could. I followed a route that would take me up and down the streets that run north of my house, and then head further south to round out the course.

I decided to check my watch at the half mile point to see what the Garmin was displaying for pace. The watch said 8:52, which seemed about right, and I figured that I could maintain that for 40 or 50 minutes. I didn't feel too overheated and I thought I was in for a run that was close to, or below, 9:00 per mile.

As it turned out, I began slowing down after passing the first mile. By the time I reached three miles, I saw that my pace was 30 seconds off my targeted range. It bothered me that my performance did not match the level of effort that I was putting into the run. After downloading the Garmin and correcting for distance errors (the GPS accuracy has been abysmal this week), I saw that I'd run the first mile in nine minutes, but my pace had crept up into the mid-nine range until improving near the end.

The combination of heat and effort prompted me to cap my run at 40 minutes, for an overall pace of 9:23. I was disappointed with that result because I felt I'd pushed harder than normal. I wanted to break nine minutes, but I don't think I did all that badly. I'm planning to go longer (and probably slower) tomorrow. It's okay really. After the past week's running, I know what I'm capable of doing.