I very much agree with this. Back when I was in high school we had some overlapping topics in Math and Physics. But in the Physics class we'd actually see things applied to the real world (e.g. a quadratic equation representing the trajectory of a cannon ball), and that made the stuff learned in Math a lot more interesting to me.
> Unfortunately, learning how to take care of your own body,
This should be fixed in PE. I only got interested in being active after I was already an adult (and a very sedentary one). For years I hated the thought of doing physical activity because I associated it with PE class and all the bullshit I had to endure (bullying and having no option but to play sports I didn't really like).
Would be nice if we were taught at school about body composition, nutrition, different results you can get from exercise (strength, hypertrophy, endurance, that kind of thing). PE is often instead a bunch of random stuff with no explanation of what results can be expected.