I decided to take today fast (bad idea), and I learned that my endurance had dropped like a rock over the past couple weeks. It didn't help that I ran during the hottest part of the day. I went out at around 6:15 pace for the first few miles and felt great, then died. I actually had to stop a couple times, which was very discouraging. 6:34 average pace.
Afterwards, I did 10 very intense minutes of core and a brief strength session.
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