The ACTN3 is sometimes called the "speed gene" but really it is not the only gene involved in speed. R is the "speed" allele while X is the "endurance" allele. However, the site below makes it pretty clear that few endurance champions have this gene whereas lots of sprinting champions do.
Having said that, there have been some (though very few) Olympic power sport champions who have no working copies of the gene.
Other genes involved include the APOE gene.
Great page on ACTN3 Gene aka the speed gene
http://kohlmanngen677s13.weebly.com/
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