Stress negatively impacts physical fitness by triggering physiological responses that can hinder performance and recovery. When under stress, the body releases cortisol, which, in excess, can lead to muscle breakdown, fat accumulation, and decreased motivation to exercise. Chronic stress might also result in fatigue and hormonal imbalances that affect energy levels. On the psychological side, stress can disrupt focus and discipline, making it challenging to maintain a consistent fitness routine. Managing stress through exercise, mindfulness, and effective coping strategies is crucial for optimizing physical performance and well-being.