Cohort progression — Bømlo SK
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 freestyle50 butterfly100 freestyle50 backstroke200 freestyle50 breaststroke100 backstroke100 butterfly100 breaststroke200 backstroke100 medley200 breaststroke400 freestyle200 medley
50 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2012 born 2011 born 2010