From the New York Times:
Courtney Dauwalter specializes in extremely long races. But her success in winning them has opened a debate about how men’s innate strength advantages apply to endurance sports.
By Rebecca Byerly, Dec. 5, 2018
Women often do better than men at extreme ocean swimming, such as Lynne Cox being the first to swim the 53-mile-wide Bering Strait:
If you had a “race” where the winner was simply the last person to die, i.e., a tontine, most of the winners would be women.
On the other hand, in the Olympic running distances from 100 meters to 26 miles, the gender gap is pretty consistently around 11% at all lengths. Perhaps this changes at these lunatic ultramarathon lengths? But militaries don’t see much evidence that women can outmarch men, so this is rather puzzling.