Cohort progression — Roskilde Svømning
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 backstroke50 butterfly100 backstroke50 breaststroke100 breaststroke100 medley200 freestyle200 medley100 butterfly200 backstroke200 breaststroke400 freestyle200 butterfly400 medley800 freestyle25 backstroke25 breaststroke
50 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2015 born 2014 born 2013