Ryan Hall, the fastest American marathon runner of all time, has retired from the sport at age 33, making the announcement four weeks before the U.S. Olympic marathon trials.
Hall, who has finished one marathon since the 2012 U.S. Olympic trials and struggled with health issues, is retiring due to “chronically low testosterone levels and fatigue so extreme … he can barely log 12 easy miles a week,” according to The New York Times.
“Up to this point, I always believed my best races were still ahead of me,” Hall said, according to the report.