Ah, yes it DOES make you wonder, doesn't it?
I can tell you from my own puppeteering experiences that it can be both fun and painful (physically) at the same time.
Back in the days when I was co-puppeteering for my local PBS station, my co-puppeteer and I had to have both of our characters appearing looking through a window from inside a little club house out to the camera at the same time - the house was wood, and there was just a front to it, while the sides were just wood-work to prop it up, meanwhile, but myself and my colleague had to squeeze inbetween the woodwork with two small metal chairs for us to sit on, and a HUGE monitor between us for us to see what the audience is seeing at home; the set wasn't up in the air, it was on the ground, because our puppets had to interact with some human characters, who were hanging out outside the clubhouse, so we're both cramped back there sitting on metal chairs, and having to make sure we make our performances believable, without bumping into each other, or getting in the others way.
If I was skinnier, it might not have been such a hassle, but shortly afterwards at the next pledge drive, I went solo in the clubhouse (since I was still the new kid on the block), and my partner was "promoted" to her own special little set, where he character served as sort of a news anchor to let the kids at home know how many pledges we have currently, how many more we'd like, what kind of special goodies they'll receive when they join the club, things like that.