The Science of Healthy Competition

Blur of Runners Competing in Marathon

Researchers at the University of Oxford found that people who train in groups can boost their pain tolerance more than those who work out alone. The scientists aren’t sure why, but they think group exercise may contribute to an underlying endorphin surge. No training partners? Pop in a pair of earphones. Music can also make strenuous exercise seem easier.

http://www.menshealth.com/spotlight/muscle/

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