I don’t know man, the Jamaicans seem to incorporate running into their lives, and not just competition (as told to me), where as over here in America, parents and coaches just throw their kids into race after race with little or no regards to complete preparation, regeneration and basic nutrition, so at the end of the day, by the time a Jamaican is about 18-20 they are just bullet proof, seasoned and have a healthy approach to competing.
Also, it’s a blunder to just copy what others do not fully understanding the program as a whole. Many distance runners do this today by trying to duplicate what they can learn from the runners in North Africa but it’s mistake.