What Causes a Runner's High - Higher Fitness Leads to More Runner's Highs - runnersworld.com

New research on endorphins is great news for longtime runners.

We all chase the elusive runner’s high. Some people describe it as “feeling strong” while other describe it as a sense of mental clarity. Suffice to say, it feels good. But most highs are addictive;… [+5602 chars]

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