Warmed up with 3 miles then ran 3X1 mile repeats at 5k pace with 1/4 mile jog in between. Target pace was 6:00/mile. First mile felt good and came in at 5:58 with my HR at 163. Second mile was slightly aided but was still a little more work (5:55 with HR at 172). The last mile was REALLY, REALLY, REALLY bad. I had a real hard time holding the pace and it was killing me. At one point my heart rate was 182 which is close to my max. It was odd that this mile was so hard considering the first 2 didn't feel that bad. Finished it in 6:06 with an average HR of 175. Pretty surprised that the pace was that fast. It felt very slow. Cooled down with 2.5 more of super slow miles.
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