Short of an early round knockout, boxers cannot afford to win only the early rounds of a fight. They must maintain an intense, but measured pace throughout a long and competitive bout. So conditioning counts almost as much as skill for boxing success. Optimal physical conditioning provides the platform from which the skills can be used. Boxing is a highly individual sport.
Fighters possess unique styles that create specific physical demands.
True champions alter their style in a way that will make them more able to attack the weaknesses of any given opponent. Improvements in specific capacities can be made, but they are only helpful if integrated into the fighter's style. Similarly, a fighter who relies on punching speed and fast footwork should not put all his training hours into heavy bag work and muscle mass development. So, the program designed must not only be specific to boxing, but also specific to the boxer. Ideally, the boxing punch consists of a synchronization between arm, leg, and trunk actions.