An interesting review (1) was published recently re-igniting the discussion whether women will ever outperform men in ultra-endurance events. Males tend to outperform females in a number of sports. For example in the marathon the difference is around 10%. However, this difference is much smaller in ultra-endurance sports, such as in ultra-marathon (with a difference of 4%), or in extreme ultra endurance events where the difference is negligible. It appears that the longer the