My physiotherapist and i have a routine.

At the end of every appointment he tells me not to do anything strange, and at the start of every appointment I tell him I did exactly that.

This week's weird thing: I bent over to pick something up, felt a shooting pain in my side and couldn't breathe for 5 seconds or so. The pain level went down fairly quickly, but some movements still hurt 4 days later. I don't know if I bruised a rib, crushed my kidney, collapsed a lung or whatever, but that was definitely an unusual effect of simply bending over.