David Epstein writes narrative non-fiction about performance, expertise, genetics and the evidence behind common claims about success. The Sports Gene examines how training, physiology, inherited traits and environment interact across different sports, using cases from sprinting, endurance, baseball and other disciplines rather than arguing for a single cause of elite performance. Range moves beyond sport to ask why broad experience and delayed specialisation can be useful in complex fields, contrasting narrow expertise with people who develop across several domains. Epstein's style is investigative and example-led, translating research through athletes, musicians, scientists and professionals rather than presenting a textbook survey. His work fits popular science, sports science, psychology of expertise and career development, especially for readers who like books that test familiar self-improvement claims against empirical evidence. Read more Less