I think he's fine and was just playing a part. The character is written as one who doesn't move around much. Also, some people are like that in real life.

@Damienracer said:

@Innovator said:

Throughout the movie he did like James Earl Jones in Coming to America 2, in that he barely moved at all. In one scene he spent it sitting on a horse, in another scene he spent lying down, and another scene he did the whole thing leaning on a wall. This left me wondering about his health.

A sick injured person isn't going to be riding a horse.

The horse didn't move either while he was sitting on it, and probably was just a dummy stand-in. When it was moving, he probably was a stand-in as well as he was shot from behind during that short ride. It was almost like Jordan Peele did everything he can to shoot Keith David's scenes in a way that he didn't have to move a muscle other than to speak.