When the production of endorphins through the execution of a desired action or process outweighs the pain or damage caused by the action or process itself.
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- Britannica, The Editors of Encyclopaedia. “Endorphin”. Encyclopedia Britannica, 5 Jan. 2012, https://www.britannica.com/science/endorphin. Accessed 8 May 2021.
- John Hopkins Medicine, The Editors of “What Are Opioids?” John Hopkins Medicine, https://www.hopkinsmedicine.org/opioids/what-are-opioids.html. Accessed 8 May 2021.