IR Track Workout #1-1

Week 1, Track Workout 1: 3x(3x400m)

400m in 1:20
1:20 rest
400m in 1:20
1:20 rest
400m in 1:18
3:30 rest
400m in 1:20
1:20 rest
400m in 1:20
1:20 rest
400m in 1:20
3:30 rest
400m in 1:20
1:20 rest
400m in 1:18
1:20 rest
400m in 1:16

Now the ring toe on my left foot is all bloody. I was wondering what hurt while I was running, other than my lungs.