That's the point. You have to understand that the hula hoop can keep turning because you have been exerting force on the hula hoop, so you have to twist your waist (and below including your feet) to generate a force through twisting, and you must follow the position of the hula hoop when twisting.
For example, you can look down at the hula hoop. When it rotates near your navel (as shown below), you have to twist your waist to push (approach) it (equivalent to applying a rotating force to the hula hoop at this time, as shown below). When the hula hoop is close to your waist, give it a rotating force with your waist.
At the beginning, the rotation range and operation can be larger. As mentioned above, the skills are not hard enough.
If an action is not used well, it may cause the hula hoop to fall off. At this time, you can try to squat quickly, and then twist hard to make the hula hoop rise faster and save it with great probability.
In the process of learning to turn a hula hoop, I found that turning a hula hoop is very similar to a person's growth process, and there are three keys: continuous exertion; Find the right action point; Rescue in time when sinking.