Competed in a marathon

RAN

Think of a three-letter word that describes moving swiftly on foot, often done in races or for exercise. It starts with the same letter as "race."

The clue "Competed in a marathon" hints at the action of running, since marathons are long-distance races where participants run. The answer "RAN" is a simple past tense of "run," fitting the idea of having completed the event. There’s no hidden wordplay here—it’s a straightforward definition where the verb directly matches the activity described.