But there is also an external load in the long cycle, and considering the load in push-ups and pull-ups as fixed is a fairly artificial concept as far as I am conderned - you can regulate your bodyweight up or down, use various amounts of kipping, a band or pulley for assistance, change the angles, use partial reps...
I wouldn’t say fixed, but the dynamics of a barbell placed on a spine contributes to a greater overall stress on structure the structure. Having to brace over an extended period of time, as is the case with high rep barbell squats (note we’re talking about back squats and not loads like a goblet, sandbag, vest…) with a mass that essentially wants to crumble your torso.
A torso will not be compressed in a pull-up or weighted push-up to the extent of the squat. Pullups offer a deconpressive component, as the feet are freed from the earth allowing the spine to freely lengthen.
In the push-up case, gravity always acts in the same direction. Down. The loading would be around the shoulder area, and although tension must be applied through the legs and torso, the overall demand on the body is less than a squat (with the bar on the back) where the load travels from the base of the neck all the way to the feet.
The load of this barbell should also exceed any external load for a push-up or pull-up by a fair amount. However, someone who can knock out pushups or Pullups with people of equal bodyweight hanging from or sitting on them has certainly developed some extraordinary strength, no doubt. There are folks, like gymnasts, break dancers, rock climbers, arm wrestlers, who exhibit excessive upper body strength comparatively to the lower body, namely because their chosen activity dictates so.
I think of Kung Fu Hustle, suddenly. An old comedy, martial arts satire where one of the villagers who basically hauls bags of concrete on his back by squatting them after an assistant loads them, displays exceptional kicking power while the tailor excels in upper body dexterity with smooth and precise movements. Side note ended
Back to the main point…
A person who weighs 165 and squats 405 should theoretically squat 165 for reps easier then one who squats 315. An extreme example, but this is not always the case. Likewise we see sprinters who run 200 m in near double the time of world record 100 m times. You’d think they’d also be 100 m champions but this is also not the case.
The individual is always the main factor. Then comes the task they wish to excel at. Then comes finding the best way to get there.
For me, a plan is a start to a goal. The plan can be perfect, and still fail you. But that doesn’t mean the goal is unreachable. It just requires adjustments. This is true of training and everyday scenarios.
One gets closer to what one wants by doing and learning more than planning a plot that will never play itself out.
Now I must return to my mystic quest. Hopefully I’ve offered some meaningful insights.