Boxing is often labeled as old-school in nature. The perseverance and mental fortitude required from a successful fighter is unique from other sports. When a boxer demonstrates courage and tenacity inside the ring, he is often labeled as a "throwback" to the golden days of boxing.
Boxing is an explosive, anaerobic sport. The act of throwing punches, round after round, while contending with an attacking opponent is a daunting task. It is perhaps the most physically demanding sport of all. The sport has been estimated as approximately 70-80% anaerobic and 20-30% aerobic. Anaerobic means to conduct an activity without oxygen. Anaerobic exercise, like boxing, stresses the muscles at a high intensity for short periods of time. As a boxer, one must punch, slip, and block with split second movements and reactions. A boxer must be prepared to fight with intensity, round after round. The body must be conditioned to throw the same explosive punches in the last round that you started with in round one.