Last 1km as 5 strokes per breath.
I seem to be favouring a return to some more endurance based sessions. 40 lengths of 5 strokes per breath is new ground for me. I'm amazed how it started off as very difficult and after about 20 lengths became fairly natural.
I am starting to understand my shoulder issue on the left - it seems to be about turning off the overactive pec - this is going to take some work.