Knead the ball
Rub the ball-prepare a stone or iron ball by hand. When just practicing, use 10 kg, press the wall with your palm and turn. When you are comfortable, you can imitate calligraphy and run on the wall. When you reach 50 kg, your skills are amazing. If you run freely on the wall with 80 kg balls, you will achieve great success. It is used to practice martial arts, like Qinshan coping, and no one can stand it.
Are you talking about this kung fu?