Les 3h de Plum' is a three-hour trail race in the Pays de Dinan area of Brittany, tied to the Challenge Crédit Agricole pays de Dinan. Runners cover repeated laps of a 3 km trail circuit, so the format is about managing effort over a fixed time rather than racing point to point. People can enter alone, as a pair, or as a team of three.
The short loop makes it practical for teammates to share the work, and local businesses get their own Challenge entreprises, where company teams race against other firms from the area. Company entrants list their business name during registration. The event also includes a Nordic walking race: 14 km mainly on forest paths and trails, counted in the Challenge Nordique Bretagne.