Spread your feet at shoulder level, put your hands on your hips, and only do hip movements, front, right, back, and left, in 4 directions, in a clockwise and counterclockwise manner. After you become proficient, you can move these 4 One position becomes 8 positions. In addition to front, right, back and left, there are also left front, left back, right front and right back. With continuous practice, the hips will definitely become very flexible.

This is how to practice rolling in poppin, you might as well try it, I wish you success