In athletics, there's a long-held belief that greatness demands specialization. To be the best, you have to start young and maintain a laserlike focus. The archetypal example is Tiger Woods, who reportedly started swinging a golf club before he could walk. Recently the focus has shifted to grit. The secret to success, we’re told, isn’t skill but the ability to persevere. Yet that may not be the whole story. In his book Range, David Epstein challenges arguments for specialization and grit, arguing that a more generalized approach is the surest route to excellence. Outside’s Christopher Keyes spoke with Epstein about the advantages of doing a bit of everything and why the most telling story of a superstar athlete doesn’t come from golf, it comes from tennis.