Cohort progression — Bålsta Simklubb
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 freestyle25 freestyle25 breaststroke50 breaststroke25 backstroke50 backstroke100 freestyle100 medley50 butterfly25 butterfly100 breaststroke100 backstroke75 medley200 freestyle200 medley
50 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2016