The athletes I had do this workout are male High School athletes, who have been 409-418 400 Free; and 16:35-17:30 1500 Free.
We have been getting after some LCM descending sets recently — as well as some other LCM Threshold-type sets that basically have been centered around repeating on (115) and (110) for LCM 100s.
We do this sort of work 2 times per week freestlye, and 1x per week IM — and balance it with a strong Backstroke “Threshold” set each week, plus 2-3 active rest sets each week (we work all strokes on Active Rest sets).