While the pigeons are performing their compulsory training the pigeonries are closed. Only with youngsters and one-year-old-pigeons Sander sometimes has to throw a ball in the air to force the pigeons to continue their training. In this way, the pigeons soon learn to train for an hour continuously. The pigeons train twice a day and when the pigeons hit 'forme' they wander off for miles.
Cor emphasizes the importance of solid training. 'When racing pigeons the natural way the pigeons must train hard. Otherwise they will fatten up and the results will collapse. Therefore, compulsory training is the most important aspect in our system. Besides that, they have to show some racing behaviour. If they're only circling around the pigeonry and not picking up speed one cannot expect good results. They have to pick up some speed.'