Cohort progression — Bromley SC
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 butterfly50 freestyle100 butterfly50 backstroke200 medley50 breaststroke100 breaststroke100 backstroke200 backstroke200 breaststroke200 freestyle400 medley400 freestyle200 butterfly