Cohort progression — CSM 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: 100 freestyle50 freestyle200 freestyle50 butterfly100 butterfly50 breaststroke400 freestyle200 medley50 backstroke100 breaststroke100 backstroke200 backstroke100 medley200 breaststroke400 medley1500 freestyle200 butterfly800 freestyle
100 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2008 born 2007