Did you view the link I provided in my first reply? I think it shows that there are substantial differences, enough to make a statement that we all have the sam

Did you view the link I provided in my first reply? I think it shows that there are substantial differences, enough to make a statement that we all have the same design range of motion either meaningless or wrong. Edit: to illustrate why I think it's so wrong to make such a statment, let's consider one of its implications. If we all have the same design range of motion and all differences are caused my muscle imbalances, then when I see someone do something I can't do, I have to conclude that the difference is a muscle imbalance. I wouldn't be surprised if this was the difference most of the time, but I think it's clearly false to say that's the correct conclusion all of the time. So I would sometimes be wrongly concluding that muscle balances are my problem and might wrongly attempt motions that I'm incapable of or waste time on exercises that can't help.