The function of endorphins during exercise is primarily to act as natural painkillers and mood enhancers. These neurotransmitters are released in response to physical stress, contributing to feelings of euphoria commonly known as the "runner's high." This process helps to mitigate discomfort during strenuous activities, encouraging individuals to push their limits. Additionally, endorphins can reduce stress and anxiety levels post-exercise, promoting overall mental well-being. Their release creates a positive feedback loop, motivating regular participation in physical activity.