His body 'totally depleted' by distance running, Ryan Hall became reenergized after turning to weightlifting

Ryan Hall may hold the fastest marathon and half marathon times for a US athlete, but these days he admits that running doesn't feel like it used to.

"It just feels like you're wearing a weight vest the whole time," says Hall, which is hardly a surprise when you consider his physical transformation since retiring from the sport five years ago.

As a professional runner racking up 120 to 140 miles a week, Hall would weigh in at a lithe 130 pounds; today, he's 190 pounds and far more likely to be found lifting weights than grinding out 20-mile long runs.