"The fastest marathoner in the United States is retiring. Ryan Hall, 33, was one of the last remaining hopes for an American front-runner in this summer's @olympics marathon. But right now, he can barely log 12 easy miles a week. Ryan's retirement comes abruptly, 2 decades into an audacious career. So what happened? He trained too hard. Testosterone is vital for optimum athletic performance, but the hormone's levels can drop over time with extreme training — like sprinting 7 miles down a 9,000-foot mountain and then running back up to do it again, one of Ryan's techniques. Now, he told @nytimessports, fatherhood is his priority. In October, Ryan and his wife, Sara — also a professional runner — adopted 4 sisters from Ethiopia. @elizabethdherman photographed the Halls at home in #Redding, California." By nytimes on Instagram.
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