Summary: Oddly enough, this lesson takes place largely lying on the back. So "on the side" doesn't refer to the position of the lesson. This lesson follows on the lesson [[On the side, the sternum becoming flexible]], which "really is" on the side.
Summary: Oddly enough, this lesson takes place largely lying on the back. So "on the side" doesn't refer to the position of the lesson. This lesson follows on the lesson [[On the side, the sternum becoming flexible]], which "really is" on the side.