Here's an alternate view. Practice methods matter a great deal because our biology allows us to be extremely adaptive. However, not everybody's biology is identical and those differences will dominate in competitions between groups of highly motivated and well coached individuals. Phelps is a particularly clear example:<p><i>Phelps, the six-times Olympic swimming champion, has size 14 feet, which act like flippers to propel him through water. He is 6ft 4in tall but has arms that span 6ft 7in from fingertip to fingertip. “If you’re putting a human being together from science this is what you want,” said Rowdy Gaines, the winner of three Olympic swimming gold medals in 1984.<p>Phelps is also faster at processing lactic acid, the fluid which makes muscles ache, than any other known human.<p>After a race, most swimmers measure a lacticity of between 10 and 15 millimoles per litre of blood. Phelps’s count after breaking a world record last year was 5.6. Genadijus Sokolovas, the Team USA physiologist, has measured 5,000 international swimmers and failed to find another with a post-race lacticity count of less than 10.</i><p><a href="http://www.scientificamerican.com/article.cfm?id=what-makes-michael-phelps-so-good" rel="nofollow">http://www.scientificamerican.com/article.cfm?id=what-makes-...</a>
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