WikipediaMichael Lee Bruner (born July 23, 1956) is an American former competition swimmer, two-time Olympic champion, and former world record-holder in two events. At the 1976 Olympics he won gold medals in the 4×200-meter freestyle relay and in the 200-meter butterfly, setting a world record. Two years...
https://en.m.wikipedia.org/wiki/Mike_Bruner
He was an older swimmer when I swam, at a level far above me.
Our coach would regale us with his mammoth workouts.
Mike was a flier but he swam a lot of free.
In swimming it is common to do sets where you have to go within a certain time.
A fast time back in the 70s would be to swim 100 yards while training under a minute for intervals.
We were told Mike once did 100 100s on a minute. His coach finally told him to quit.
Coach told us that when we were complaining about doing ten.