Thank you for the replies.
Well I have just noticed that the weight I can pull on standing cable rows is topping out- seems like I now need to lean back to pull more, which I think is cheating and a waste of time. So I just want to know if I am at my weight limit and if so, then I will stop trying to increase it. Or is it because I am not strong enough? I am already pulling more than 40% of my BW. I just need to know when to throw in the towel and move on. See? At the same time, I like standing rows and would like to keep them.
I also don’t understand the comment about just chosing the exercise that allows me to pull my max. I think the bent over barbell row is the most taxing yet it lets me pull the least.
I think “experts” should be able to figure out the equivalents based on physics and mechanics somehow- like there are force couples in all except the prone chest supported rows (which makes me feel ill). “The sum of the forces and moments must equal zero…” Or something like that? Newtons laws of motion I think?
The only standard on rows I have found is:
45 degree 1/4 Bent Over Row (65)(105)(135)
So there should be a way to convert that to other types of rows? 135 pounds is less weight that typical bodyweight and that is at 45 degrees. What is it at 90? Standing? Seated? See what I mean?
Basically I want to know what the limits are. Also as goalposts- it is nice to have something other than “as much as possible” as an objective. (which actually is not my objective).