Hardest sports ? Whether or not sports rank high for their difficulty varies, but some always stand out because of their tough fitness and mental aspects. Examples are boxing, gymnastics, wrestling, tennis, mixed martial arts, swimming and ice hockey. They need athletes to be very fit, highly focused and to train for years. Doing sports means dealing with a lot of risks, and for some, it’s a season filled with games with not much time to rest. The hardest sports push athletes to their absolute limits, testing strength, speed, agility, and resilience. Fans, coaches, and athletes all tend to agree that these are the hardest challenges in all different sports.