Brian Gaff (Sofa) laid this down on his screen :
Well the key is where you take the shock. It only takes a surprisingly small
current across the chest to kill you merely by stopping your heart, that is
why the one hand in your pocket advice is so useful.

Across the chest is the worst possible type of shock, almost as bad is
from the hand and down through the body to the wet feet.

They do still use a type of electric shock machine. They sometimes call
them 'TENS' commonly available with a type sold on TV ads. (Think
cricketer). Idea is the controlled electric shocks, trigger local
muscles, which also helps stimulate circulation and maybe use up fat in
the body.