Bad Run Day

Scheduled for 4 x 1/2 mile intervals. Ran a 9:00 warmup with Dave then started the 1/2 mile repeats with 3 minute cooldown. Trying for a 3:30 pace. I felt tired and a little off right from the start. It was 6 am and in the 80's with a breeze and moderate humidity. The first half was 3:07, too fast and it went downhill from there. Second half was 3:27, third; 3:45. Every one was hard work, harder than it should have been. We decided to do a half mile cooldown and skip the last one. Just one of those days I guess. I just didn't have it. The melon I ate at 4:30 didn't settle well. Easy 3 miler tomorrow so I'll hope for a better day.