So anyway, winning in ninja warrior isn't about fitness.
It's about talent and skill, and upper body strength/weight ratio.
After you weed out all the amateurs, what separates ppl at the top is talent. Most commonly, the top guys don't wipe out because they're not fit enough. They're plenty fit enough. But they wipe out cuz they don't know the course, or they made a mental error and a physics miscalculation.
And weight/strength ratio matters so much more than overall fitness. You can be plenty fit but if you weigh too much you're at a disadvantage. You can be plenty light but if you don't have the upper body strength you're out of luck too.
That takes out 200 plus pounds Americans and women. A woman can be as fit as she wants but since she's not a man she won't be able to do it. Out of thousands of women who been competing for the existence of this competition, only one woman has even made it to the mountain. And she couldn't repeat that this past summer.
At least in crossfit they separate men and women and scale according to gender.
When you take into account everything I've said, it's no wonder that the only people to finish the whole thing are Japanese men.