Wow!  that's a long time to be upside down.  I bet Rosie doesn't hang upside down that long, and I doubt that these people were taking advantage of the situation, repeating a mantra, to have a calming effect on their bodies. 

Or.  more than likely most of them were saying some sort of mantra.

please, god, please.  fluck all you!  when I get down, I'm gonna sue!