Genetics is a wonderful subject and plenty of athletes who involve in various types of rough and tough sports have unique genetic make-up. There is a genetic test known as ACTN3-genotyping-Sports-Gene test which is done on the athletes to find out the roles played by the sports gene. It is worth to note that ACTN3 produces alpha-actinin-3 that is found in fast twitch muscle fibers. Lab technicians will request the subjects to do exercises on hi-tech knee machine and find out the genetic makeup of the person.