A balance in perspective, -especially in reports involving genetic screening and issues -is always healty. ACTN3 is neither the only factor of the many other yet-unknown factors influencing athletic performance, and nor it is the crucial precipitating factor towards it. The genetic variation of ACTN3 is a minor ingredient in a large and complex recipe called athletic performance. Bottomline thus goes: ACTN3 doesn't tell/ guarantee one whether or not the child will be a super-athlete. As the viewpoint of one the author [Daniel MacArthur] of the discovery of the link between ACTN3 and athletic performance shows, in the article- "The ACTN3 sports gene test: what can it really tell you?" http://scienceblogs.com/geneticfuture/2008/11/...