Cohort progression — SMS Ostrowiec Św.
Median season-best times of each birth-year cohort, overlaid by age — shows how consecutive groups developed at the same stage of training.
Event: 100 butterfly50 freestyle100 freestyle50 butterfly200 freestyle400 freestyle200 medley100 backstroke100 breaststroke50 backstroke50 breaststroke200 breaststroke200 backstroke200 butterfly400 medley800 freestyle1500 freestyle
100 m butterfly men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2009 born 2008