The runner's high is a transient state of euphoria coupled with lessened feelings of anxiety and a higher pain threshold, which can come either from continuous moderate physical exertion over time or from short bursts of high-intensity exercise. The exact prevalence is unknown, but it seems to be a relatively rare phenomenon that not every athlete experiences.[1] The name comes from distance running, and it is alternatively called "rower's high" in rowing.[2][3][4][5]