Most schools don't have much in the way of actual qigong, so they call movement, martial and structure training "qigong." Look at Xie Peiqi and He Jinbao's material. There is zhanzhuang, there is circle-walking and there is Bagua qigong. All three are separate. Adam Hsu merely describes the circle-walking and posture holding as beneficial to the health because these practices exercises and massage the joints through a full range of motion and likely also have a massaging effect on the internal organs. He never says they are qigong, just that they are good for your health. Like Tantui, the Eight Mother Palms, circle-walking and so on, are beneficial to qigong practice, because of the stretching and breathing components. However, there is still a big difference between them and exercises specifically designed for moving the qi in specific ways. That is qigong.