The biggest secret is the hardship. This same example, but in a different sport has existed in Brazil. They have produced the best football players and are 5 times world champions. It is also because of the hardship these kids are born into and this being their only way out. They stay focused and dedicate all their time to achieving their dream. Why are black american basketball players so good? Same reason. They are born into poor areas and difficult situations. Their desire to succeed is soo great that they develop an amazing training discipline and focus.