20 Are swimmers swimming faster?

“Swimming could be taught by lecturing the student swimmers in the classroom three times a week on the various kinds of strokes and the principles of buoyancy and so forth. Some might believe that on completing such a course of study, the graduates would all eagerly run down to the pool, jump in, and swim at once. But I think it’s much more likely that they would want to stay in the classroom to teach a fresh lot of students all that they had learned.”
— George Box

Background Comparing swimmers’ best times for different strokes and distances.

Questions Which strokes are swum fastest? How much faster are men than women? What effect did full body swimsuits have?

Sources Website of the International Swimming Federation (FINA (2021))

Structure 7685 observations of 23 variables