While this was a long time ago and memory fades with time I can envisage no circumstances where I would be able to remain voluntarily bent for twelve strokes.
To me the essence of giving and taking a caning is the voluntary aspect of so doing.
To voluntarily report at given time knowing you are to be caned, to voluntarily bend over, to voluntarily remain bent while being caned, implies agreement or acceptance of the discipline, even if it’s unwillingly.
In order to take twelve strokes I am sure that I would have to be restrained.
By restraining me the whole aspect of the voluntary submission has been removed.