For shoulders and posture, I understand that the rhomboids are important and I see the rhomboid exercise in your book.
What is your opinion on the serratus muscle and how it fits in with shoulder position and primal posture? Do you suggest exercises that we should do for them too?
My pilates teacher often emphasizes the importance of the Serratus muscles when doing exercises. Especially to keep the shoulders out of the neck when supporting the head during ab exercises. And also when holding plank position.
I feel she is one of the better ones as she always emphasizes the importance of a small lumbar curve in neutral spine.