Cohort progression — St. KP Olimpia Świecie
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 freestyle50 backstroke100 freestyle50 butterfly50 breaststroke100 backstroke200 freestyle100 butterfly100 medley25 freestyle200 medley25 backstroke100 breaststroke400 freestyle200 backstroke200 breaststroke25 butterfly200 butterfly800 freestyle
50 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2015 born 2014