Reverse Warrior
How to do it
Set up in Warrior II: feet wide, front knee bent over the ankle, back foot grounded and turned in slightly, arms reaching out front and back at shoulder height. Turn the front palm face-up. Reach that arm up and back over your ear while the back hand slides lightly down the back thigh. Keep the front knee bent and both feet exactly where they were. Lengthen the front-leg side of the waist upward rather than collapsing the other side. Hold and breathe, then switch sides.
Why it's good for runners
Running and lifting load you almost entirely front-to-back. The side of the body — the obliques, the lat, the connection from hip to shoulder — is the part that never gets asked for anything, and it is also the part that has to resist rotation on every stride. Reverse Warrior is the one shape in the method that lengthens that whole line at once, from the front hip to the fingertips, while the legs stay loaded underneath.
It also earns its place by where it sits. Warrior I and II both keep the back heel planted and flow into each other by opening the torso alone; Reverse Warrior is the same stance again with the torso reaching. That makes the arc plant, open, reach, lift — and the reach is the only beat in it that touches the side body.
Common mistakes
Don't lean back instead of reaching up. The shape is a long line, not a backbend, and going backward before you have gone tall is what pinches the low back. Don't let the back hand carry your weight — it rests on the thigh, it does not prop you. And don't let the front knee straighten or fall inward when the torso moves; if the legs change, you have lost the pose.