i've been doing the wall extension for a few weeks now. in the article coach sommers said to keep the hips feet and back pressed firmly against the wall. what part of the bacK?
when i start moving my arms up the wall only my upper back (shoulder blades i believe) stay touching the wall and it is impossible for me to have any other part of my back touching the wall while i have my arms touching the wall.
what does this mean about my posture?