Gravity is the science that keeps you from floating off planet; they teach you that in grade school. It’s also the science that crushes your bones if you don’t resist it, and maybe they didn’t teach you that.
Homeostasis is the science of your amazing body’s constant effort to be healthy, and you might not have learned that either, because so much of it is happening deep inside without you needing to think about it.
Life without back pain (or hip, knee, neck, and shoulder pain) requires you to think about it. You must think to seek muscular skeletal homeostasis, by resisting gravity and moving without unnecessary force.
That, my dears, is the whole point of The Yoga You Need, and yes, it’s a science.
But your body is designed to heal, feel good, and function without pain for 100 years. We blame the body when it breaks down, but mostly it is the world we've created, and the way we live in it. Your body does the best it can, until it can't anymore.