Cohort progression — Club sportiv "Bogdan Ciubotariu" Constanta
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 freestyle200 freestyle100 freestyle200 medley50 butterfly50 backstroke100 butterfly400 freestyle100 backstroke50 breaststroke
50 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2011