Can someone help me to understand this concept? In particular, why so many people watch it - what drives them them do so?

I'll try to explain my own vision, why I think I don't care - which, of course, is entirely subjective thing, so despite it may read as such it's not exactly meant to say "[some] pro sports are nonsense" but rather more of "[some] pro sports don't make sense for me".

Say, Olympic games. I can watch the opening ceremony (it can be visually or aesthetically impressive), but I don't care about the actual event. Yea, some folks do some impressive things, that... utterly fail to impress me. I'll try to explain why, and I wonder how others are different in this regard.

I can understand watching sports that have a significant strategy component to them. I would've probably watched Go or chess if I would be able to understand what's going on there (I don't), but I occasionally watch e-sports and those can impress me with how people think outside of the box, doing things that no one thought of - but that are so obvious in the hindsight. For those kind of sports, when I understand the game mechanics and when those feel interesting to me, I can relate and feel engaged.

I have a suspicion that a number of people watch it (among other reasons) for the "this is our athlete(s) doing it" vibe. This is something that doesn't click with me. Never really did when I was a kid (the country I was born in doesn't exist - and good riddance), and since then I've immigrated a few times, so - long story short - save for obligatory subconscious biases, I don't care about other folks' flags and passports. But even though this is not commonplace (I guess), this doesn't feel like a reason why I have no feelings for the Olympics. Back to the e-sports example, I watch international events, and people from different bubbles bringing their different strategies and play styles makes watching fun, as the games are more diverse.

So, when someone's running, jumping, lifting, throwing, shooting, spinning, or alike... I honestly don't get what impresses so many viewers so much everyone and their dog seem to be glued to the screens. Please don't get me wrong, I don't want to diminish athletes' personal (or team) achievements. What they're doing is objectively impressive, but subjectively it's in some... detached, unrelated way. Also, as someone raised on sci-fi I can't shake off the feeling of it being sort of unimportant or meaningless on a global scale - I suppose I'm gonna give post-/trans-human Olympics a try, if I'll live to the day, maybe I'll find something to cheer for. Not sure.

Either way, in the modern day, personally, I don't feel any engagement as I fail to relate with the athlete, leading to the total lack of the entertainment value for me. Best I can do is "uh, that looks fast/heavy/far/...", but 9s, 9.5s, or 12s are all the same for me - just "fast" - nothing in my brain fires off, as I don't have any experience of such speeds/levels of exertion anyway. So I wonder, does it for others, do they subconsciously tighten their muscles watching, do they feel connected or something? Maybe not, because people also watch races and I suppose they don't associate with horses?

As you can see, with all this blabbering and guessing (sorry!) - I'm really confused here. I realize that even if someone explains it to me, I still won't feel that way, but what I'm missing is the idea - I only have guesses, and I have no clue how accurate they are. And I'm curious to understand others, even if a tiniest bit better.

====> tl;dr: If y'all watch the professional sports (esp. if aren't an athlete yourself), what makes you engaged and entertained watching it?

Thanks!