内啡肽:
https://baike.baidu.com/item/%E5%86%85%E5%95%A1%E8%82%BD/1902660#:~:text=%E5%86%85%E5%95%A1%E8%82%BD%EF%BC%88endorphin%EF%BC%89%EF%BC%8C,%E5%A4%A9%E7%84%B6%E7%9A%84%E9%95%87%E7%97%9B%E5%89%82%E3%80%82
https://www.youtube.com/watch?v=U3aSopinI-k