When I was taking organic chemistry in college, it was very clear that was a weed out class. Anyone who wants to be a physician, or a healthcare provider typically have to take that course. It has a physical therapist there have been exactly 0 days that I have used anything I learned in organic chemistry, with one exception.
That exception is the resiliency behind doing hard things. Most people quit organic chemistry after they get their first 40 or lower on an exam. After that first semester, enrollment typically goes from 40 to 60 students down to 30 to 50. Those who make it through the second semester with at least a C or D grade, typically graduate with their biology, or chemistry, or pre-medical degree, and go on to medical school, or dental school, or physical therapy school.
Then, once they're in graduate school, there is another set of weed out classes. These are designed for two reasons number one the information is actually relevant to the profession, so it's important that it's learned and understood. Second, if you can't pass that class, you certainly can't handle patient care. You're not cut out for that profession.
I heard it said once that the walls are put up to see who is willing to bust through them, climb over them, dig underneath them, or run around them.
I tell our incoming freshmen that high school soccer is 2 to 2 1/2 hours a day, 5-6 days a week. That is sometimes enough to ‘weed out’ those who are not willing or able to make that commitment.
Then I tell them what the expectations are on our fitness tests. Soccer is a running sport. The average player, run 6 miles during a game. I don't run them for the sake of running them, I run them because we need to prepare them adequately for the demands of the game. When they find out those expectations, some are unwilling or unable to meet those demands. That's another version of ensuring we get the right people in our program.
I'm sure you have your own version of those. My challenge for you is to verbalize those to your players. Be transparent with them, and let them know that you want to see who can make it through the challenges, to call them self hey Caldwell girl soccer player.
