I should refresh myself sometime soon but from memory of my training there is an element of "appropriate position" involved in the back blows technique. It can

I should refresh myself sometime soon but from memory of my training there is an element of "appropriate position" involved in the back blows technique. It can work in any position but there is a "safest" one that should be used if the situation allows for it. From memory the position involves leaning them forward as far as practicable. They still discuss the Heimlich manoeuvre, but advised us all that, like putting a dislocated shoulder back in its socket, it seems simple enough but there is much room for things to go wrong.