Articles usually introduce scuba as being a “recreational sport”. PADI’s magazine is known as Sport Diver. Individuals often ask if cheerleading is a sport^1^, then again how about scuba diving?
“An activity involving physical exertion and skill in which an individual or team competes against another or others for entertainment.”
Therefore, as you simply cannot consider diving a sport according to the standard meaning, it may be by an additional, albeit dated, definition. This really makes it subjective label. Is it right to regard it as a sport taking the old world term, or would you prefer to follow modern definitions?
In my opinion, the answer a lot of people accept, particularly in journalism, depends upon the context, i.e., when they can’t arrive at a synonym that actually works besides sport, certainly they call it a sport. You are absolutely free to do the same way.