Genetic testing available for sprint versus endurance talent

There was a piece on the radio this afternoon about a genetic test for sprint versus endurance aptitude depending, I think, on something to do with fast and slow twitch muscles. Just send a check and a cheek swab to a lab in Australia and find out where your genetic predisposition lies! www.genetictechnologies.com.au/index_athletic.asp The radio piece centered on the potential of using this technology to screen children and was against it. I'm not endorsing the technology, just thought it was interesting food for thought.