Marathon Man is a term used to describe a RUNNER or RACER who participates in long-distance running events, such as marathons. The term Marathon Man can be broken down into two crossword solutions: RUNNER (6 letters) and RACER (5 letters). Both words refer to someone who competes in long-distance running events, but the term 'RUNNER' is more general and can refer to any type of running, while 'RACER' is more specific and implies that the person is competing against others.