(HealthDay News) -- Despite all the training, sweat, dedication and sacrifice that goes into becoming an Olympic competitor, these elite athletes also tend to have an advantage that average sports lovers lack: superior DNA. Just like eye color or a keen intellect, a constellation of the "right" genes can grace certain athletes with world-class speed, strength and endurance. But with the advent of gene therapy -- technology on the cusp of helping treat grave illnesses -- are the days of "natural selection" of super-athletes coming to an end? Genetics and athletics experts fear that the 2012 Olympic Games, opening Friday in London, may be the last without competitors secretly hinging their...
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