The strength of the wrist mainly depends on the forearm, so exercise the muscles of the forearm. ...
Hold dumbbells or barbells back and forth.
Starting posture: Hold the bell forward or backward with both hands, and squat down. Put your forearm on your thigh, and stretch your wrist forward and hang it in front of your knees. The reverse grip mainly exercises the medial forearm muscles. Mainly holding and training the lateral forearm muscles. You can also stick your upper arm on a flat or inclined board, or take turns lifting dumbbells.
During the movement, the forearm is flat on the thigh, and only the wrist flexes upward and inward as far as possible (refers to the contraction of the flexor muscles), and stands still for one second until it can no longer flex. Relax the forearm muscles and let the wrist fall forward.
Breathing method Inhale when bending wrist, and exhale when leaning back.
Note that when you bend to the end, you must try your best to contract the forearm muscles (flexors) for one second, and then gradually relax.