
Frank T. answered 04/20/19
Ph.D. in Film & TV Studies (UCLA) with 35 years of Teaching/Publishing
Almost always, these scenes are shot by having a sling around the performer's chest, which is somehow connected (unseen) to his/her noose. So, the person is actually dangling there by a rope around the chest and under the arms -- not by a rope around the neck.
Unless the director wants real authenticity! :-)