York was fighting backaches and required help on set
Wikia
Ever wonder why York was either constantly sitting or lying down when the cameras rolled? That’s because he had back issues. His back problems were severely painful and too much for him to bear that he needed special furniture to make him comfortable. His co-stars even needed to assist him as he moved around on set. They were there for him, and while it was a difficult thing to go through, the public was never made aware of this.