Sit upright on a chair with your hands on your hips and your feet flat on the floor.
Begin by slumping, rounding your shoulders and dropping your head.
Your body weight should be settled through your tail bone.
Gradually roll yourself upwards from your tail bone until your weight is through your seat bones.
Lift your head up and look straight ahead.
Bring your shoulders back and down, pushing your chest out a little.
Repeat this movement.
When you are sitting as tall as you can, relax back a little and hold.
This is the pelvic neutral position.