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vealed elevated levels of endocannabinoids(内源性大庥素)in their systems."We didn't see that in the ferrets,Raichlen said. One major benefit to achieving a runner's high is that it makes exercise more enjoyable.By extension,this makes people more likely to stick to an exercise routine,which is a key compo- nent of long-term heart health,according to the American Heart Association.There is also good evidence that,over the long term,exercise can help reduce anxiety and stress,according to research published in 2006 in the Primary Care Companion to The Journal of Clinical Psychiatry.So go ahead and lace up your shoes.You're free to chase that runner's high as far as it takes you.