Often the question is asked whether top athletes are born or bred. The answer is both, but probably more of the former than the latter. Most very successful athletes are born (genetics) with the propensity to excel physically at a particular sport. Training can then improve that potential. This is mostly true for sports that are endurance based or involve extreme power, as mentioned. An athlete's genes direct the formation of more Type I or Type muscle cells and body design and potential for skill development to excel at one or more sports. Then, to truly excel at a sport, the athlete must train and practice to optimize that performance.
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