Furthermore, I can observe personalized effects over long time spans - e.g. change in physical condition after lifting or getting enough sleep for x amount of time.
That is the exact same approach to meditation, what is your qualm?
Furthermore, I am yet to hear someone explain these depths in meditation that everyone seems to allude too. As far as I know it's "sit still, focus on one thing or push away all thoughts." Or chant a mantra, if you want to pay for Transcendental Meditation lessons which come up with a personalized mantra that makes zero sense at all.