I'm not saying that to be snarky. Just as an FYI that it can be kinda hard to even describe how one came across this knowledge. Like asking someone how they know LC circuits act as a resonator.

And I guess exercise science is even less popular than physics. You can find the latter on Wikipedia, and a bit of the former too:

https://en.m.wikipedia.org/wiki/Exercise_physiology

There is a lot of great YouTube content about exercise physiology too, if you can cut through the "bro science" ecosystem.

Their videos have a section where they link the sources. In this case https://sites.google.com/view/sources-workoutparadox