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How to do a wall sit with shoulder rotation
Stand with your back to a wall.
Align your feet with your hips and begin walking your legs away from the wall.
Slide your back carefully down the wall until your knees are positioned at a right angle.
Your feet should still be facing outwards and aligned with your hips, and most of your weight should be supported by your heels. Now raise your arms so they're touching the wall at your shoulders.