Mental fatigue refers to a state of reduced cognitive performance and motivation, which can significantly impact physical performance. It results from prolonged periods of mental exertion, leading to feelings of weariness and decreased concentration. In sports and exercise, mental fatigue can reduce a person's perception of effort and hinder their motivation, often leading to suboptimal performance. Strategies to combat mental fatigue include regular breaks, mindfulness practices, and adequate sleep, which can help maintain focus and energy levels. Practicing mental resilience alongside physical training is essential for achieving optimal performance.