What's the fastest a human can run the 100-meter sprint? What's the longest a human can hold his breath? What are the limits of human performance? Until 1954, common wisdom and scientific knowledge considered a sub-four-minute mile an impossible feat--but today the world record stands at 3 minutes, 43 seconds. Records are a mark of how well people have done, not how well they can do. What's the actual limit? In this thought-provoking book, John Brenkus, co-creator of ESPN's Sport Science, ventures across the sports world to provide an in-depth look at the absolute limits of human performance. Beginning with the current world records for a variety of sports, Brenkus finds the perfection point for each--the speeds, heights, distances, and times that humans will get closer to but never exceed.--From publisher description.