Copy editors are in danger of workplace injuries. Lift with your legs and take vitamin C during the winter.
Seriously though, this is not a gig where you have to be in constant fear of something heavy landing on you or of your desk spontaneously combusting. Part of the reason you ended up working an office job is because you were never cut out for carrying crying children out of burning buildings or mining for coal. That's okay. We all have our place. Besides, we believe you when you say you're a fiercely competitive thumb-wrestler.