Cohort progression — Schwimmclub Bülach
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 freestyle100 backstroke200 medley50 freestyle100 breaststroke200 freestyle100 butterfly50 butterfly400 freestyle200 backstroke400 medley50 breaststroke50 backstroke200 butterfly