CBS Sunday Morning -- probably not a TV program you watch, but I happened to have it on when a story presented about
Testing an Athelete's Genes to Training http://www.cbsnews.com/videos/testing-an-athletes-genes-to-aid-training/
The story talked about whether Kenyans were genetically advantaged to winning marathons. Because of the hot, dry climate at high altitudes, some Kenyans have developed long legs and a thin torso--perfect for running marathons. However, Kenyans that win marathons get government sponsorship. This provides an economic incentive for runners to practice running marathons. Top athletes run 100+ miles per week.
The situation begged the investigation: which is a greater predictor of athletic performance, genetics or practice? A professor of Kineseology in Canada was interviewed who said that genetics had little to do with athletic performance. Yes, it was practice more than any other factor. To test that theory, they had the country's top softball pitcher pitch against some major league baseball hitters. The baseball hitters could not even get a foul ball! Reason? They had practiced, practiced, practiced against a different style of pitching. Through practice, the baseball hitters had wired their brain to adapt to fast pitch baseball. No genetics were involved, just practice. Rather interesting.
