Cohort progression — Køge Svømmeklub
Median season-best times of each birth-year cohort, overlaid by age — shows how consecutive groups developed at the same stage of training.
Event: 100 freestyle50 freestyle100 backstroke50 butterfly50 breaststroke100 breaststroke100 medley50 backstroke200 medley200 freestyle100 butterfly200 backstroke200 breaststroke400 freestyle400 medley200 butterfly25 butterfly25 breaststroke25 backstroke25 unknown
100 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2017 born 2016 born 2015 born 2014