Endorphins are chemicals produced in the brain during exercise that elevate mood and create a sense of well-being. Often referred to as "feel-good" hormones, endorphins can lead to reduced perception of pain and increased pleasure during physical activity, creating a euphoric sensation often described as the "runner's high." Regular exercise can increase endorphin levels, promoting a positive outlook and reducing symptoms of stress, anxiety, and depression, ultimately enhancing mental health and motivation for continued activity.