Cohort progression — Aqua-Team Grójec
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 freestyle100 backstroke50 freestyle100 breaststroke50 backstroke50 breaststroke200 freestyle50 butterfly200 backstroke400 freestyle200 breaststroke100 butterfly50 unknown
100 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2012 born 2011