Sunday was a 7 mile run with one of my athletes.
Yesterday I felt drained and flat, so it was a rest day.
Today I felt good. So-
3 X 300 meters on 6:00 rest.
All three were the fastest I've ever run a 300. The first two were ~90-95% efforts holding back a tiny bit. The last one I admit to pushing to near best effort, still started relaxed though.
My previous fastest 300 in a workout was a 41.6 a couple of weeks before I ran my 55.9 400 race last year.