There are several general concepts, which helped to shape the specific
program. First, the work profile of boxing is repeated 3-minute rounds
of activity, often with very high intensity bursts within a round. The
rounds are separated by one-minute rest intervals. Thus, the relative
contribution of anaerobic energy release pathways is considered
extremely important, with aerobic capacity playing an important role in
terms of facilitating rapid recovery. Extreme conditioning is required
to fight effectively for ten intense, 3-minute rounds and anaerobic
endurance is a key aspect that cannot be overlooked.
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.
The best way to simulate the demands of boxing is to use conditioning
methods, which mimic the work/rest ratio and integrated bursts of power
that typify boxing. I continue to use "suicides" and different versions
of my H.I.G.T program to keep my fighters as well as my clients in peak
physical condition.
Boxing
is a highly individual sport. Fighters possess unique styles that
create specific physical demands. Some rely on explosive strength
("power"), for others it's starting strength ("speed"), and for most a
combination of the two ("speed-strength"). True champions change 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. For
example, extensive footwork exercises may not benefit the power puncher
who fights stationary and looks to deliver a blow that starts with the
legs and drives right through the opponent, and wins that way.
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 synchronization between arm, leg, and trunk actions. The punching movement of a boxer consists of leg extension, trunk rotation, and arm extension, in succession. The more effective the coordination between arms, legs and trunk movements are the greatest and the impact force of a punch. The leg muscles play a vital role in the power developed in this sequence. Increasing leg force development and coordinating it with trunk and arm action is probably the most effective way to increase punching power.
Because boxing is an explosive sport, ballistic training methods are especially effective during weight training for boxing. This kind of training method requires the athlete to perform each repetition explosively, with maximal intended velocity. Finally, in my view, the best way to weight train for competitive boxing is via a cycled training schedule. This type of training schedule integrates workouts and exercises that will meet all the basic performance demands of boxing, strength, power, speed, agility, and strength endurance.