Cohort progression — Błysk Jarosław
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 breaststroke100 freestyle50 backstroke100 breaststroke200 freestyle100 backstroke50 butterfly100 medley200 breaststroke200 medley100 butterfly
50 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2014 born 2013 born 2012 born 2011