Keep your feet shoulder-width apart and hold your hips with your hands. Then try to keep your shoulders and hips in the same position. The middle part of the upper body extends forward from the waist above the shoulder and protrudes backward.

When moving to the side, move the upper body as flat as possible. At this time, the shoulders are parallel to the ground, and the upper body and waist move in parallel. Don't arch your shoulders during the process, try not to move, let your body drive, both sides are the same.

There is only one connection between front, back and front. When practicing alone, you can see that the waist can take the initiative to bring the upper body in a single action, and you can practice connecting. The order is front and back, and each point is in place. Draw a circle and practice more, and the waist will be more flexible and thinner.

The practice for the crotch is similar, the same posture, but the knees are slightly bent and squatted, then the crotch is pushed forward, paying attention to the part above the waist, then practicing leaning backwards, and then practicing removing the crotch on both sides. Pay special attention to the part above the waist at this time. After a single exercise, you can turn around in the order of front and back.

Stick to it, and you will find that twisting your hips in the dance can separate your hips from your waist.

I am a dance teacher. I hope my answer can help you. Because this needs practice and it is best to be taught by a teacher, you should pay attention to all the details, but I hope you can learn successfully as soon as possible through your own trial and error:)