How the Two-Hour Marathon Limit Was Broken

On Saturday, October 12, 2019, Eliud Kipchoge became the first person ever to run a marathon in under two hours, a staggering achievement in athletics and human performance. Dr. Michael Joyner, an exercise physiologist at the Mayo Clinic, first predicted it might be possible in a paper he wrote in 1991. WIRED's Robbie Gonzalez has been following Kipchoge's attempts for years, and spoke with Joyner about how Kipchoge finally made it happen.