I need something to do when I'm not working, or I crawl up the walls. So I've just taken up kung fu. I was looking for some kind of calming, relaxing activity. I tried yoga, but it wasn't really me.
I don't know how it is now but the assistant stage manager had to understudy several parts. You had to be ready to go on at any time if the actor couldn't make it to the play. I didn't think anything of it.
And I really do think that the difficulty of research makes it more real to you than punching a thing to find out how many men were killed at this particular action.