Cohort progression — IKS AWF Warszawa
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 freestyle50 backstroke200 freestyle100 backstroke50 breaststroke100 breaststroke50 butterfly400 freestyle200 medley150 medley100 butterfly
50 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2011 born 2007 born 2006 born 2003