From Shape magazine, July 2009:
"Researchers at Barry University found that runners who did a core workout every other day for six weeks shaved 30 more seconds off their 5k time than athletes who stuck to a running-only routine. 'Strong core muscles prevent you from over-rotating your trunk and swinging your arms out too far--two things that slow you down,' says Kimi Sato, the study's lead author and a Ph.D. candidate at the University of Northern Colorado. 'They also improve your posture, which helps you run more efficiently."
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