Cohort progression — Lambertseter 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 breaststroke50 backstroke100 breaststroke200 freestyle100 butterfly100 backstroke200 medley400 freestyle200 breaststroke400 medley200 backstroke200 butterfly800 freestyle1500 freestyle