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plural endorphins
(biochemistry) Any of a group of peptide hormones found in the mammalian brain that act as neurotransmitters and have properties similar to morphine. quotations examples
The explanation for the depression-reducing effects of exercise that clearly has been the most popular with the media is the endorphin hypothesis (see Hoffmann, 1997), which has also been discussed as a possible explanation in nearly every exercise-depression literature review.
2019, Curt L. Lox, Kathleen A. Martin Ginis, Heather L. Gainforth, Steven J. Petruzzello, The Psychology of Exercise: Integrating Theory and Practice, Routledge