To my relief, today’s session was much closer to last Friday’s performance than yesterday’s, with my 50m reps coming in around 44/45s with the occasional 43, and the 25m reps mostly in the low 19s and I think just the one 18.
I really don’t know why yesterday was so poor, but hopefully I can put that behind me now. I’m going to swim this set for the rest of the week I think (20 x 50m on 85s, rest, then 25m reps until I run out of time) to make sure everything is stable before I drop another five seconds off the interval time for next week.