
I totally spaced there and had no idea what you were talking about for a minute!
Funnily enough, I've not worked in TV/film, so my comments are totally geared to a theatre experience. My second puppetry show I self-produced was 30 minutes long - despite this, the puppeteers were practically falling over afterwards. Why? Because the material I had used in the muppets mouths (thick matte board) was so difficult to move that they found their hands cramping up - on top of having to hold their arms in 90 degree angles for most of the show.
If only there had been ad breaks

(Hey, is that were the "naked arm" joke comes from? Puppeteers removing the puppets to rest a while and then getting caught "with their pants down" so to speak by the camera?)