Part of the reason may be that it stimulates your body to release a number of hormones like endorphins and endocannabinoids that help block pain, improve sleep, and sedate you.
Exercise also seems to help mood. Part of the reason may be that it stimulates your body to release a number of hormones like endorphins and endocannabinoids that help block pain, improve sleep, and sedate you. Some of them (endocannabinoids) may be responsible for the euphoric feeling, or “runner’s high,” that some people report after long runs.