pǎo bù / guò hòu / rén tǐ / huì / fēn mì / nǎo nèi fēi / ràng / rén / xīn qíng / yú kuài

跑步过后，人体会分泌脑内啡，让人心情愉快。

After running, the body releases endorphins, making people feel happy.