Last night, I wasn’t sure I could pull off one 400 m interval at 5:30 pace, but I got a good night’s sleep and “boarded” the treadmill will some amount of determination this morning. I finished all 8 intervals and they actually got a little easier as I went along. I think I started to relax a little toward the end.
5 minutes walking
5 minutes at 10:00 pace
8 400 m intervals at 5:27 pace with walking recovery
5 minutes cool down