Cohort progression — Schwimmclub Bottmingen-Oberwil
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 butterfly50 backstroke100 freestyle100 breaststroke50 breaststroke100 butterfly200 butterfly100 backstroke200 freestyle25 freestyle200 breaststroke