Another attempt at my current set:
400m front crawl warm-up
25 x 50m front crawl, target time 51s, rest interval 24s
200m front crawl swim down
And once again I managed the entire set with all the reps under 50s. Very pleased with this. It seems like real progress.
USRPT distance this year: 51,150m
Total distance this year: 116,100m