Don't know about the five athletic points for the old Mr America, but had been told about some other requirements that were athletic. Do well in a few of the Olympic lifts, press over bwt, hand balance or whatever. Also had to be well spoken, before the judging panel, and answer questions. Just like the Miss America, strange back than. Harold Poole, who was clearly a top contender, had a speech problem and was said to have lost points for that. Maybe being black was another thing. Good posture and well groomed included in all this.
Also prejudging had different phases of posing. One was under national/outdoor sun. The other under overhead stage lighting. There was also a relaxed side, front and rear view of the BB'ers. Judges looked for all kind of physical flaws. When standing relaxed and natural, a lot of flaws will be noticed, big time.
Might be quite a sight if the modern Pro's had to do any of this. Some have a hard time walking and chewing gum at the same time.. Some even get out of breath just walking.