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|  | | Select few redefine human abilities To the average person, swimming a mile in the frigid waters off Antarctica, diving more than 500 feet underwater on a single breath, or climbing the world's highest mountains without the help of extra oxygen would be deadly. But a select few in the world decide to push the limits of their bodies, and challenge medicine to redefine what is humanly possible. Full story » Gallery: Dr. Sanjay Gupta tests the limits Video gallery: Watch more of Dr. Sanjay Gupta on "Life Beyond Limits"  E-mail: Send questions to an extreme sports doctor joining CNN's "House Call" Editor's Note: Most of the activities profiled in this Special Report are extremely dangerous and are performed or closely monitored by highly trained individuals. You should not attempt them yourself. | | ||||||
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