Additional Cues:

Hang loose to drop your ribcage and use your core muscles to flatten your spine against the wall.

Maintaining spine contact with the wall, pinch the shoulder blades back and bring your arms into a W position as shown in the video. You can start with your hands lower to start if needed. If this is already difficult, just hold this position. If not, slowly reach the arms up into a Y.

Only move within a comfortable range where you are not using your upper traps too much (shrugging your shoulders up) or letting your ribs flare out (spine come off the wall).