Regular exercise boosts mental health by increasing the production of endorphins and serotonin, which improve mood and reduce feelings of depression. Physical activity also lowers stress hormones like cortisol, enhances sleep quality, and promotes social interaction, all vital for emotional well-being. Exercise helps preserve cognitive function, boosts self-esteem, and provides a sense of purpose and routine. Even moderate activities like walking, swimming, or yoga can significantly protect against depression and support long-term mental resilience in older adults.