The heavy bag is an integral part of a boxer's upper-body workout.
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Boxers have different body types and different areas of strength. As such, they have focused workouts based on a number of factors. While pushups are both effective and important, they are far from the main emphasis in a boxer's upper-body conditioning routine. Workouts for boxers need to address more than just the ability to lift their own weight.
Power, Speed and Endurance
In boxing, the upper body is primarily responsible for technical aspects such as accuracy, endurance, defense and the ability to land punches. Balance, power and movement are mostly controlled by the lower body. Which training and conditioning methods are most effective depends largely on the individual boxer's strengths and weaknesses in these areas, as well as on factors such as weight class. These factors will help boxers and their trainers determine which muscles should get the most focus, and which exercises are best.
Pushups are indeed an important exercise to include in a boxer's workout routine. This exercise builds power and strength in the chest and shoulders, as well as in the triceps and core muscles. But pushups are just one type of exercise relying on the body's own weight that boxers typically do. Pullups, chinups and dips are also effective for building strength and endurance in the upper body.
Boxers don't rely on bodyweight exercises alone. Weight training is also a fundamental aspect of upper-body conditioning. Besides dumbbell exercises, such as rows, and barbell exercises, such as the military press, medicine ball exercises such as slams and slide throws are also used to strengthen the arms, shoulders and core muscles. Many boxers also rely on simple tricks of the trade such as using weighted gloves and jump ropes in their workouts.
Punching bags are primary tools in a boxer's conditioning. Punching a heavy bag improves fighting mechanics as well as providing conditioning to the entire body, including the arms and shoulders. It's an essential workout for improving overall power. The speed bag also helps to train the arms and fists for speed and accuracy.