Cohort progression — Næstved 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: 50 freestyle100 freestyle50 backstroke100 backstroke50 butterfly50 breaststroke100 breaststroke100 medley200 freestyle100 butterfly200 medley200 backstroke200 breaststroke400 freestyle200 butterfly400 medley800 freestyle25 butterfly25 backstroke25 freestyle
50 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2015 born 2014 born 2013