what chemical is released when you feel pain
When you exercise, your body releases chemicals called endorphins. These endorphins interact with the receptors in your brain that reduce your perception of pain. Endorphins also trigger a positive feeling in the body, similar to that of morphine. For example, the feeling that follows a run or workout is often described as euphoric. That feeling, known as a runner's high, can be accompanied by a positive and energizing outlook on life.