Putting someone in the recovery position
because did you know you can drown in your own saliva!!
Stopping a bleed
you actually have to elevate the arm :)
and most importantly
and also some other things like sorting out burns
helping someone in a potential heart attack while they wait for the paramedics
and helping someone in shock "
and somone with a fit "
It's good to know :)
Though I hope I never have to do it for real
though practising was fun
even if it did hurt my hand