Les foulées d'Isidore is a race day in Lezennes offering distances for almost every kind of runner, from a half marathon down to a 400-metre run. The longest race is 21.1 km, followed by 10 km and 5 km options, allowing adults to choose anything from a full endurance effort to a shorter road race.
The programme is spread across the day rather than run as one mass start. The half marathon and 10 km start in the morning, the 5 km races follow later, and the shortest distances come after that, with 2 km and 1 km races plus the 0.4 km event for the youngest runners or beginners.