Maybe that's true, but we're also talking about also being combat effective at the same time. This whole conversation started with my link to an article about how they should integrate women into special forces because that will go better than infantry integration first. My argument was that 75% of men who signed up for special forces training and knew what they were getting into can't pass. Presumably they are a much smaller subset of the larger male population.
For Ranger school, you have to carry at least 70lbs for a 12 mile march in 3 hours. Per runner's world, the median half-marathon time of a man is 2 hours. If we're talking just carrying 60 lbs of gear for 12 miles in unlimited time, sure 25% of men probably can do that, but to do it at a level required by special forces schools even fully rested and fed, I'm skeptical.