Cohort progression — MKS Płetval Polkowice
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 butterfly100 freestyle50 backstroke100 butterfly50 breaststroke200 medley100 breaststroke100 backstroke100 medley200 breaststroke200 freestyle
50 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2007 born 2005 born 2004 born 2003