ACTN3 and the super-sprinter gene is the gene found in elite athletes around the world. The ACTN3 makes a special protein This the "...controls fast-twitch muscle fibers, the cells responsible for the speedy tensing and flexing of the muscles involved in sprinting or weight-lifting". Many elite athletes have one mutation, I was surprised when my 23andme results (see below) said … [Read more...] about ACTN3 and the super-sprinter gene (I got it)