Runner’s High
Description: The "runner's high" is a feeling of euphoria that occurs during and after strenuous exercise. Research has show that this occurs when endorphins are released in the peripheral nervous system and eventually bind to receptors in the brain. Endorphins are mainly used to block pain in the body. This could be used as a phenomenon related to homeostasis and interacting body systems.
Web Resource: Neurobiological Effects of Physical Exercise - Wikipedia