Why We Fight explores what it truly takes to reach the pinnacle of martial arts, following three fighters whose battles in the ring mirror the personal challenges they face beyond it. A teenage girl, driven and disciplined, trains in Muay Thai under the guidance of her father, whose coaching blurs the line between love and ambition. A world-title-winning female boxer navigates the intimate and demanding dynamic of training under her husband while chasing peak performance. A once-promising MMA fighter returns to the sport after the loss of his brother and a period of addiction, determined to make one final attempt at glory. Through their journeys, Why We Fight captures the relentless pursuit of excellence, the sacrifices required to reach it, and the discipline, ambition, and perseverance that drive athletes to push beyond their limits.