These authors prove the greats are great because they have purpose, potency, performance skills, and they practice powerfully. You will love reading the inside stories of sports team achievements. You'll come to understand that the New York Yankees are great, because they demand greatness of themselves decade after decade. (Some trivia, Yankees' Phil Rizzuto's brother was my shoemaker. He was as competent a shoemaker as his brother was a baseball star.)
Again in the stories, you'll see stars focus their talents by stepping up to the bar of challenges they must overcome to achieve their dreams. They practice to create the future they desire and share their dream within a support system. Their potency comes from harmony within, passion within and without,and achievement of the flow state, individually and as a team. And, they perform beyond their endurance, creatively, continually besting themselves.
Bottom line, success is an organized and consistent effort. The great teams constantly ask themselves, "If we can do this today, what can we do tomorrow?"