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Jeff Pack is in his 40s and he just started competing in endurance events three years ago.  He recently completed an Olympic distance triathlon in the Galapagos Islands and he followed it up with a half ironman distance race in Paracas, Peru.

Jeff is an American living in Ecuador and he trains at an elevation of 9,000 feet.  He was very well prepared for each of these races and hit his goal for each.

Links

http://www.runnersworld.com/heart/can-running-kill-you