AJB is an intervention to prevent juvenile delinquency in at-risk youth. AJB targets adolescents between the ages of 12 to 18 from disadvantaged neighbourhoods with high crime rates and those in special education or the lowest level of regular education. Through sport clinics delivered at school by professional coaches, youth are stimulated to take part in structured leisure activities at selected sports clubs.

At the sports clubs, youth participate in (indoor) soccer, baseball or basketball training in special AJB-teams. The coaches are selected on the basis of their ability to act as role models and to deal with adolescents with behaviour problems. During the training, specific attention is given to behavioural difficulties of the participants.

The programme aims to create a safe (educational) environment, with positive relationships between the coach and the participants. The coaches are expected to be clear about desirable and undesirable behaviour and to be a good example to the young people. The participants of AJB are approached in a positive, respectful way and are motivated to join prosocial activities at the sports club. If necessary, the coach provides individual guidance to the participants and discusses concerns about the behaviour with the school. 

AJB coordinators ensure good coordination between the schools and sports clubs. AJB is now being implemented in several municipalities in the Netherlands and in Aruba, Curaçao, Bonaire and Sint Maarten.