Cat-cow isn't just a stretch, it's about moving your scapula through external rotation, internal rotation, thoracic extension, and retraction. Focusing on these joint actions instead of muscle activation gives you real shoulder and spine mobility.
So we talk about the muscles being used in this. This isn't really so much about the muscles, it's about the joints articulating through the scapula. So muscles that we're going to be working— well, I mean, we've got our upper back, but external rotation, internal rotation, thoracic extension and retraction. But really it is about articulating the joint, it's articulating the scapula when we do a cat-cow.
