I've now done the first 2 sessions on week 3 and these have revealed my ongoing problems with pacing. On Tuesday I did 7 sets of 300m (well that was the plan but some shorter and some longer) and despite trying to start gently my pace gradually declined. The first set was done in 6:56 the last in 7:44. By the end I felt really tired and found the waves and buffeting from adjacent swimmers hard work.
Today I was supposed to be increasing the effort within 500m sets so that the pace increased a by few seconds every 100m. I started gently to give myself a chance and then ramped it up, or so I thought! The first 2 steps I tried to use more power and improve the feel and to a degree that worked. Then for the 4th and 5th blocks I tried to increase stroke rate too.That didn't work and I was simply tiring myself out. Notably, as on Tuesday my performance fell across the sets.
At least trying to increase pace meant that I did maintain it within a set showing that effort has to increase and an apparently slow start is essential. There were't any fast lengths at all today, the best being just under 44s.