Calf: A boxer does not rely on the energy of his arms to defeat the other. The coordination of the feet and the transformation of the footsteps are especially important for fighting. Even with sandbag exercises, you have to do some foot bounces in the gap between punches, and this requires calf strength.
Root of thigh: The calf is responsible for the middle movement of the footsteps, and the root of the thigh is responsible for how much bouncing force each punch can have. The thick thighs of boxers can give full play to their greater lethality when they make heavy punches, helping them to seal the victory. If you are willing to improve the jumping power of the thigh muscles, you must do more energy training for certain thigh muscles, and heavy-loaded squatting can have very good practical results.
Waist: When the foot exerts force, the waist will follow the shaking, and then transmit the energy of the foot to the upper body. When moving and dodging in the footsteps, the abdomen must also move in coordination with each other, so the frequency of application of the abdomen is higher than that of the thigh.
Shoulders: A boxer cannot ensure the destructive power of punches only by the energy of his arms. The shoulders are a key part. In fact, basically all postures must cooperate with the shoulders. The shoulder is not the position of force, its agility and physical strength are more critical. The recommendation of a barbell and its horizontal lift can improve shoulder coordination and strength.