system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] Does Tony Stark ever exert himself when lifting something heavy while he's wearing the Iron Man suit, and if so, why?

The Iron Man suit has vast strength, compared to human muscle. Therefore, any lifting effort that Tony puts into lifting something heavy is just a drop in the bucket, compared to what the suit is already putting out, and really it just puts Tony at risk of herniating himself. Really, if there's anything that he can't lift effortlessly while wearing the suit, then there should be no point in straining his muscles, because there's nothing more for him to add to the mix. So, why should any physical feat ever be difficult for Iron Man, when the suit's strength is the only strength that has any real impact?
gpt
Yes and no.  The suit works by amplifying his movements and the force required, so he can just as easily pickup anything from a paperclip to something reaching the maximum of what the suit is capable of.  However, the problem with that sort of thing is that without some sort of feedback you don't know how much force you're exerting.  You don't want to try to pick up an egg only to crush it, or shake the presidents hand and accidentally take his arm off.  To work around this, Tony incorporated a haptic feedback system into his suit which simulates how much force the suit itself is applying.  That way he knows whether he's giving something a gentle nudge or is going to send it flying.  So yes, he exerts himself, but its entirely for usability and not some sort of limitation of the suit itself.