Gotta say, that's a remarkably slow headache bag. Put a lower connection on it.
yes I know in fact it was written in the video that the string is too long and that's why in the video was written do this for 15 rounds + moving unceasingly around to compensate that so to last 3 rounds in a real situation
You are totally right an aikido dojo is not the place for this
You don't need to do that in a dojo my point is be aware this demand will be real in a real fight so consider adding this workout when outside the dojo