Today I was focussing on effort with the goal of a progression across six 100m sets. As before I mostly failed to achieve this. The pattern seems to be a stupidly slow set, followed by 2 good ones and the a final few that have more strokes but very little better pace. As I tire the lack of gain for effort becomes clearer. Basically it seems that as I increase stroke rate, unless I'm really fresh, there is no net gain in pace.
I did manage a few 100m sets at around 2:21min/100m and no individual lengths at better than 2:15min/100m which isn't great. On the plus side I've looked back at old swimming data and noted that I used to struggle to manage 4min/100m. Now on the warm ups I'm not quite achieving 3min/100m but feel that I could do. I think I need to do a 1000m test with legs (i.e. without pull buoy) to make a fair comparison.
Recently I have suspected that the pool has a distinct flow and in the lane I was in today it was clear that I was working against the pump for the last 8m or so of the shallow end.