[hanamizu]

They why are all the records held by men?

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The really long-distance records, like swimming the Channel, are held by women. Their extra body fat not only insulates them, but lets them float higher so less of their energy is expended on keeping above water.

[TexasGator]

“The really long-distance records, like swimming the Channel, are held by women. “

Really?

“The fastest verified swim of the Channel was by the Australian Trent Grimsey on 8 September 2012, in 6 hours 55 minutes,[86][87] beating the previous record set in 2007 by Bulgarian swimmer Petar Stoychev.”

https://en.wikipedia.org/wiki/English_Channel#By_swimming

[super7man]

Not according to Wikipedia.

Record Swimmer Time Date
Men, Trent Grimsey 6:55 2012
Women, Yvetta Hlavaova 7:25 2006

Men two ways, Philip Rush 16:10 1987
Women two ways, Susie Maroney 17:14 1991

Men three ways, Philip Rush 28:21:00 1987
Women three ways, Alison Streete 34:40:00 1990