The involvement of the brain's opioid system in runner's high suggests one possible explanation for why:
A) endurance athletes enter a meditative state during long training sessions.
B) sedentary people find it so difficult to begin an exercise routine.
C) some people can become addicted to excessive exercise.
D) athletes perform better when cheered on by a crowd.

Question

Quizplus · Accepted Answer

The opioid system is involved in the reward and pleasure pathways of the brain, and excessive exercise can trigger the release of endorphins and other opioid receptors. This can lead to feelings of euphoria and reward, which can potentially result in addiction to exercise.

The Involvement of the Brain's Opioid System in Runner's High