Cohort progression — Chelsea & Westminster SC

Median season-best times of each birth-year cohort, overlaid by age — shows how consecutive groups developed at the same stage of training.

Sex: WomenMen Pool: 25 m pool50 m pool

Event: 50 freestyle 50 butterfly 100 freestyle 200 freestyle 50 backstroke 100 backstroke 100 butterfly 50 breaststroke 200 backstroke 200 medley 400 freestyle 200 breaststroke 100 breaststroke

Cohorts to compare: 2015 4 2014 8 2013 12 2012 5 2011 4 2010 5 2008 5 2007 3 2004 3

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