Point your spine when leaning back in a chair.
Your torso can act as a bridge from the seat to the backrest.
Lots of people ask about reclining or leaning back in a chair. I think it helps to know the difference between your waist and your hip joints, and to continue to point your spine.
Collapsing in a chair may seem comfortable, but it restricts breathing and causes stiffness. Proper sitting, even reclining as shown, is a lively activity that is part of the continuum of how we move and do things. More liveliness means less stiffness. There is a video of this tip here.
More on sitting in a chair:
Think of the Chair as your Legs
Video: How to Lean Back in a Chair
Video: Think of the Chair as Your Legs
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