At the end of the day nearly every sport comes down to endurance. A major key component of winning in competition is making sure you can handle fatigue for longer than your opponent or competition. This also plays out in military and security industries. The side that can go harder, for longer, and make the least mistakes, and maintain their skills under fatigue, is the side that usually wins. Everybody regardless of the sport or industry is susceptible to fatigue, particularly mental or cognitive fatigue. When cognitive capacity is reduced and perception of effort is higher, it is harder for ANY HUMAN to continue to perform a task at the level they desire. So no, this is not just for endurance athletes and those competing in long races or competitions. Any individual with a brain is susceptible to fatigue and therefore will benefit from having a greater capacity for cognitive fatigue and more mental endurance.