KPj, what's your position on someone wanting to work-in on the power rack but who is lifting a significantly different weight?
I never say no, but it sh!ts me if someone wants to come in and do 40 kg curls when I am squatting 100+. I don't need to waste calories re-loading the bar!
I get harrassed by trainers all the time. I think it's because I'm small (5'7", 155 lbs). They don't bother the big guys. I usually end up with them coming over while I'm warming up. Although once they see that I've got decent strength, they leave me alone. Even got a complement on my squat once, which was nice.
I used to secretly hate the extra conditioning but I would still do it. I've always enjoyed helping people - which is why i'm trying to make a career out of it. However, i'm just used to it now. I train with 3 beginners along side me. I squat 2-3 times what 2 of them squat. I DL 3-4 times what those 2 DL. So, there's a lot of loading and unloading going on. When they just started, we used to have to change the box height to adjust depth for each beginner, too. So, the bar and the box would be loaded and unloaded between sets in accordance with each lifter. They all squat below parallel now so we don't need to adjust height. We used to also train with the previous manager in the gym, who lifted more than me, so it would be even worse for him! He pulled 640lbs and squatted 550lbs alongside beginners who were lifting 135lbs. You've got to 'pass it on', ya know.
However, we have a nice unspoken rule that the person who is doing the next set or has done the last set doesn't need to load. Which means my beginners typically load up the bar for me, then strip it back down
I've never had someone work in with me on squats to do curls, though. I've had a big freaky Bodybuilder do seated BB shoulder press with more weight than I was front squatting at the time. That was a shot to the ego.
It helps to use smaller discs. On squats we use no heavier than 15KG discs. No 20's. It's much easier to adjust and work up the weight for everyone. We do the same on bench. On DL's, we start with the 20's to get the propper ROM but everything after that is 15's, 10's, 5's, etc.