Intervals

Today I tried doing some speed work. I did intervals. I ran at about 80-90 percent of as hard as I could run for half mile bursts, with short walks in between to catch my breath. It's hard to say how fast I went. My Garmen isn't really reliable for short distances, but it said I was averaging around 7 1/2 - 8 minute miles (7.5-8 mph) for those bursts. I did 3 half mile burst, and I almost did a fourth, but I petered out at 0.30 mile. I did 2 quarter mile bursts after that at full tilt. My average speed on my last burst was 6 minute 48 second mile pace (8.8 mph).