Mental fatigue can significantly influence physical performance by impairing focus, coordination, and motivation. It may result from prolonged cognitive tasks, leading to decreased energy levels and increased perceived effort during physical activities. When an individual is mentally fatigued, their reaction times may slow, and their endurance can suffer, ultimately impacting overall athletic performance. Addressing mental fatigue through adequate rest, hydration, and mindfulness practices can help optimize physical capabilities, ensuring better outcomes in exercise and sports.