Exercise core strength and explosiveness. Practice side waist strength and strength transmission. Although the sledgehammer is easy to swing, if you want to hit it crisp and loud, you must let the sledgehammer face down, which is difficult to do, and you must use your waist muscles. Moreover, when I practiced, I obviously found that the left swing was not as good as the right swing, indicating that the left power was weak. The waist can be ensured to be symmetrical.