If your answer centers on getting your son or daughter a college scholarship, creating a young Olympian, or even making them the star of their team, then it might be best to reconsider this option. These types of goals need to come from your children themselves, and, in most cases, at the latter stages of their sports careers.
In addition, it is very important to keep in mind that only a very small percentage of athletes (out of the significant number who participate in sports) will ever reach a level high enough to garner a college scholarship, and an even smaller percentage will gain Olympic status. The odds against the latter are astronomical.
On the other hand, if you are looking to give your children an opportunity to learn solid fundamentals, develop good overall coordination, balance, and agility (along with other physical skills that expand their range of skills), and that you believe that the extra training will enhance their chances of developing a "love of the game" or love of sports participation in general, then a performance enhancement professional might be a good option. A performance enhancement expert's contribution to achieving these objectives with your children can be immeasurable. However, the key to making a good decision will be in knowing what to look for when selecting and hiring such a qualified expert.