Earlier quoted context omitted.
I think you need to define perfectly fit. Can you do 10 pullups?
99% of the population can’t do 1 pull-up, let alone 10. Most of the people I go to the gym with would struggle with more than a few. Hell, even marines and rangers have lower fitness standards (3 and 6 dead hang chin ups respectively).
3 is for men over 51. And that's the bare minimum, not get kicked out of the marines threshold.
To reach top rank scoring is more like 15-17 for most ages. Mid rank is about 11 or up.
Maybe 99% of the population can't do a pullup, but I feel that's an overestimate. In any case, that says more about our overall societal weakness than anything else.
What are your gym friends doing if they couldn't do more than a few? Are they strength training or just doing cardio? Serious question, I'm curious. With a few months training ar age 26 I was able to do 5 reps of my bodyweight + about 40 pounds IIRC. And now, even when I periodically stop strength training, I am rarely below 8-10 when I start again.
Chin-ups are hard, but they're not that hard if you train them or do any activity that works those muscles.