Speed Work

This morning I got up at 5:30 for speed work. I had programmed my Garmin for 400 w/ 200 rest intervals. I did a one mile warm up then started the intervals.
I swear I thought I programmed 8 but as I was running number 7 thinking “when is my stupid Garmin going to beep?” I looked at it and discovered I was already 0.4 miles into my cool down. I walked for a little bit to get my heart rate back down then jogged home.
Splits look like this
Warm up: 1 mile at 11:43
400’s 7:50, 7:37, 7:37, 7:49, 7:25, 7:45
Cool down: 1 mile at 10:47

Total distance 4.28 miles with an average heart rate of 125 and a max of 174.