And yeah, they definitely look worse when listed off in bulk. You're probably best off picking a small handful that play to your strengths as a person and figuring out how to ruthlessly make habits of them.
The thing is -- cliché doesn't mean easy. Many clichés in both athletics and wealth building are very easy to understand on an intellectual level, but hard (for whatever reason) to put into practice for the required duration to reap the benefit. So there will always be a market for them to be remixed, repackaged, and expounded on ad infinitum, since the end results usually remain out of most people's grasp.
 I'm not saying all clichés are universal truths, just that many universal truths have at least one expression as a cliché
 I'm reminded of an exchange between two affiliate marketers on Twitter:
Aff-1: "It's 2015 and people still broke"
Aff-2: "It's 2015 and people still fat"
I assume that elite athletes aren't complete idiots, though. When an interviewer asks them how they got where they are, it's not great PR to say "luck" or "genetics" or "my parents forced me", even if that were the most accurate explanation.
"I worked really hard for it" is the story that people want to hear.
Which is more likely: that cliché statements get repeated because of how true they are, or because of how much people like hearing them? Fiction has always sold much better than nonfiction.
With athletics there are bunch of pre-reqs, and a lot of luck but for most physical sports your going to have to work as hard as you possibly can for years. The genetics and working hard makes you a competitor, then you have to find an edge to actually win.