A rather good article on why women are doing so well in endurance events:
www.theguardian.com/lifeandstyle/2020/jan/03/female-ultra-athletes-leading-field-women-less-ego
Contains these bold sentences:
"Until about the age of 10, girls and boys are, athletically speaking, the same. Top running speed is the same for boys and girls, as is top swimming speed. Then puberty happens and testosterone changes everything. By 14, boys have bigger hearts, stronger arms, bigger shoulders, longer limbs, greater muscle mass. More power, and more speed, for life."
And
"When it comes to speed, men will always be first across the line. No woman will outsprint Usain Bolt. No woman will hit the side of the pool ahead of Michael Phelps’s world records."
Guardian's sub-editors must have been dozing after too much Christmas pud when they let those through.