Endorphins are neurotransmitters released during physical activity, associated with the feelings of euphoria known as the "runner’s high." These chemicals help alleviate pain and induce positive emotions by interacting with the brain's opioid receptors. As exercise intensity increases, endorphin production can rise, leading to enhanced mood and reduced stress levels. This natural response not only encourages people to engage in regular physical activity but also contributes to overall mental well-being, providing psychological benefits that can reduce symptoms of anxiety and depression, thereby improving the quality of life.