Cohort progression — Zryw Opole
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 freestyle200 freestyle400 freestyle50 freestyle50 butterfly800 freestyle200 medley400 medley200 backstroke100 butterfly100 breaststroke200 butterfly100 medley200 breaststroke