Hard run today

I was going to try to beat my last 5k time today. I decided to increase the speed of each leg by .1 mph from my last run. I made a mistake, and actually increased the speed by .6 mph. I damn near killed myself. That had me on a pace to run the 5k in 20:59, which was significantly faster than my PR. I ended up slowing down and had a good run, but I just ended up doing a normal HIIT instead of a 5k. I'll give it another shot on Thursday. Maybe I can get it done in a 22:15. I'll see.