Legs Up the Wall
How to do it
Sit sideways on the floor with one hip touching a wall. Lie back and swing both legs up it, shuffling your hips as close to the wall as is comfortable. Let the arms rest wide with the palms up. Then move through three shapes without coming down: legs straight up the wall, then sliding wide apart, then feet drawn down toward each other until the soles meet and the knees fall open. When you are done, bend the knees into the chest and roll onto your side before getting up.
Why it's good for runners
Nothing else in the method puts the legs above the heart, and after three hours on your feet that alone changes how they feel. The legs have spent the whole run fighting gravity to send blood back up; inverting them for a few minutes hands that job to gravity instead, and the heaviness comes out of them faster than it does lying flat.
The three shapes are what make it more than a rest position. Straight up lengthens the whole back of the leg from heel to sitting bone. Wide opens the inner thighs — the tissue running never asks for and the one that quietly limits how the hips move. Soles together takes both hips into external rotation. That is the entire lower body, one chain at a time, and the wall is doing all the holding. You are not stretching anything so much as putting the leg somewhere and getting out of the way.
It is also the most reliably down-regulating shape in the method after corpse. Being inverted, supported and still is a strong signal to a nervous system that has been switched on all morning.
Common mistakes
Don't force your hips against the wall. If the backs of the legs are screaming or the low back arches off the floor, you are too close — shuffle back until the pose is boring, because boring is where it works. Don't insist on straight legs; bend them. Don't stay if the feet go numb or tingly, which means the hips are too high or you have been there too long. And don't leap up at the end — roll onto your side first and give yourself a moment, or the head-rush will do it for you.