Stress negatively impacts physical health and fitness by triggering the release of cortisol, a hormone that can lead to fatigue, weight gain, and decreased immune function. High-stress levels can cause individuals to neglect their fitness routines due to feelings of being overwhelmed or exhausted. It can also contribute to unhealthy coping mechanisms, such as overeating or substance abuse, further hindering fitness goals. Managing stress through techniques like meditation, awareness practices, and regular physical activity can help mitigate these effects and improve overall health.