The Method
It all comes down to two postures.
Two postures. One pattern moving between them, in perfect flow.
Cat is flexion.
Your core braces, your front body engages, and you're set up to resist a load pushing toward you. When you push into the floor, press into a wall, or drive against a band — that's Cat. You're contracting against the direction the resistance is coming from, stabilizing your joints while you move through full range of motion.
Cow is extension.
Your back extends, and your entire core — front, sides, all the way around — braces at the same time. It's not a collapse into your lower back. It's supported extension. You're resisting a load pulling away from you, the same way. When you're pulling or deadlifting, gravity's dragging on the weight. Cow is your answer: contract your back muscles while bracing your whole core against that pull.
The pattern most people miss.
Watch someone walk, swim, or climb. One side of their body is doing Cat while the other side does Cow — and then they trade. The diagonal exchange happens over and over. Your body isn't choosing one posture and staying there. It's flowing between them, using both to move the way it's designed to. That's the foundation. Understand Cat and Cow, see how they answer different loads, and suddenly every exercise makes sense.