Often, boxing is referred to as the hardest sport out there because it tests every part of an athlete’s physical and mental capacity. You need strength, speed, kinetics, and endurance, and the ability to move in precise ways… The sport is mentally disciplined, focused, and has tremendous resilience under pressure. Matches are physically brutal and require the likes of peak conditioning. Recovery, diet, and mindset play huge roles in an athlete’s success. None of the other sports are near the level of such an intense, combative environment, putting as much pressure on one individual. Because of this, boxing remains the toughest sport according to several rankings and expert opinions.