Again there's a change of routine with the new session requiring 4 fast lengths after 8 slow. This is both a longer duration of effort and an increased ratio of fast to slow. The data show that I didn't do well and achieved 2:00min/100m or better pace on just two lengths.
Perhaps I worked too hard on the warm-up in which I broke my 5:00min threshold (4:56.3). Hooray! My best kicking pace is now similar to my lazy pace with the pull buoy.