The Willingen MTB routes for children are so well networked and signposted that parents and children can decide during the tour which route to take and how long the route should be.
Important: The requirement profiles are only guidelines - these can of course vary from child to child. Children shouldn't bike alone here either. Mountain bikes are required in any case. Driving on the routes is at your own risk. Sometimes hikers or car traffic can be on the same paths.