Are star athletes like Usain Bolt, Michael Phelps, and Serena Williams genetic freaks put on Earth to dominate their respective sports? Or are they simply normal people who overcame their biological limits through sheer force of will and obsessive training? Based on his bestselling book The Sports Gene: Inside the Science of Extraordinary Athletic Performance, David Epstein tackles the great nature vs. nurture de-bate and how the relationship between biological endowments and a competitor’s training environment affects athleticism.