Cohort progression — RUCH Grudziądz
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 freestyle100 freestyle100 backstroke50 backstroke100 breaststroke50 breaststroke200 freestyle200 medley50 butterfly100 medley400 freestyle200 backstroke200 breaststroke
50 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2003 born 2002 born 2000