HOW: While in a seated position, place your hands down on the surface at your side. Push into the table or surface with both hands using your shoulder blade muscles to try and lift your hips off of the table (it’s okay if they don’t actually lift up). Hold that for a couple of seconds and relax.
FEEL: You should feel your shoulder blade muscles working.
COMPENSATION: Keep your back upright, don’t slouch. Keep your elbows straight as you push into the table or surface.