Wrist muscles, of course. Practice with dumbbells, with elbows on the contact stool and wrists swinging up and down, one group 12. According to your maximum weight, each group is aggravated by one level, 3~6 groups. You can't always practice one place when practicing muscles, which is easy to strain. When wrestling, you should buckle inward first. In addition, the length of your arm is also very important, much longer than your arm.