① One hand and two balls move back and forth in the palm by friction. Alternate left and right hands, every 3~5 minutes. You can let your left hand move more time and develop the function of the right hemisphere of the brain.

(2) Hold the two balls in the palm of your hand with one hand, and gradually rotate alternately on the basis of friction rotation until the two balls rotate away from each other. The direction and function of rotation are the same as friction rotation.

③ Rotation with syllables.

(4) Jumping and everting.

⑤ Two hands and four balls.

Everyone's palm is different. When choosing a ball, you should pay attention to choosing the one that suits your palm. And hollow spheres are preferred. Hollow balls do not consume physical strength, and the amount of exercise is relatively small compared with other balls.