Cohort progression — Szczecineckie Towarzystwo Pływackie Masters
Median season-best times of each birth-year cohort, overlaid by age — shows how consecutive groups developed at the same stage of training.
Event: 50 breaststroke50 freestyle50 backstroke100 backstroke100 freestyle100 breaststroke200 freestyle200 breaststroke100 medley200 backstroke
50 m breaststroke men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 1956 born 1940