12 x 1/4 mile repeats

Speed work, running 12 x 1/4 mile repeats. Warmed up with a mile, then stretched, then started into the repeats with 2 minute walking recoveries. Wasn't too bad. First mile was in 9:46, then I had repeats at 7:35 pace, 7:17, 7:26, 7:17, 7:12, 7:16, 7:20, 6:59, 7:22, 7:25, 7:30 (up the overpass hill) and 7:25. I then cooled down with a 9:37 mile. Total of 6.8 miles in 1:07:24, average pace of 9:55, average heart rate of 153.