It would really depend on what you mean by natural.
In one sense all movement is natural, since it comes from you.
So the question could be would the movement give you any problems if you train it in the long run? The only answer to this is yes, since all movements , in the long run, will make the joints deteriate. Some can hold longer and some can't.
If the questions if it doens''t put strain on the body then the answer is no, since everthing puts some kind of strain on the body.
So maybe we are left with : Something that feels OK. And can that be natural? Nope, since it's a feeling an depened on the invidual it can't be natrual, but it can be the best thing for the person.