Step 1: Place a wedge on a chair. Your wedge can be a rolled up towel that you place on the back part of the chair to help you tip your pelvis forward when you sit.
Step 2: Stand with your back to the chair and with your feet hip-width apart.
Step 3: Position your feet in a kidney bean shape. Place slightly more weight on the outer edge of the foot. By doing this you will align your feet and legs in the optimal position. If you have difficulty, don’t worry, you can skip this step and come back to it later.
Step 4: Bend at the hips. As you lower yourself onto the front of the edge of the wedge, bend at your hips and then at your knees. By doing this, you will have successfully tipped your pelvis forward and have it positioned between your legs.
Step 5: Anchor your rib cage down. This next step takes some practice but is very important! Don’t give up here. Contract your upper abdominals to pull the front of your rib cage downwards and inwards. Imagine you are slightly hunching the center of your back around the kidney area, without rounding the upper back and rounding your shoulder forward. When you do this, your lower back lengthens and becomes straight and it eliminates any pressure on the lower back caused by the pelvis being tipped forward.
Step 6: Hinge. Move your hips only to return to an upright position. Be sure to leave your pelvis tipped forward and your ribcage anchored.
Step 7: Shoulders back. One shoulder at a time, roll them back. Be sure to not let your rib cage move with your shoulders causing your lower back to sway. If you turn your palms face up and rest them on your thighs and then draw your elbows back about 3 inches you will retract your shoulder blades without loosing the rib anchor.
Step 8: Lengthen your Neck and Relax. Completely relax your body and make sure you have a combination of a tipped pelvis and a relatively straight back. Look in a mirror to make sure. If you have, skip to step 14.
Trouble shooting-
Step 10: Severely tipped pelvis. Overtipping forces an arch in your lower back and can be corrected by shifting your weight to the left and lifting your right buttock, then repositioning the right sitz bones slightly forward and repeating the same on the opposite side.
Step 11: Swaying? Resist the tendency to sway, If you find that you are swaying, go back to step 5, and concentrate on using your abdominal muscles, especially your internal obliques.
Step 12: Slumping? If you are slumping, try to tip your pelvis further forward.