paul, a distance runner who weighs about as much as a napkin, isn't just thin, with the 120 miles a week he's logging each week, he's marathin
marathin (adj)  uncharacteristically thin due to marathon training
"paul, a distance runner who weighs about as much as a napkin, isn't just thin, with the 120 miles a week he's logging each week, he's marathin" What is the definition of "marathin"?