The team of the TOP project has been working in this subject since 2004: the consult for obese adolescents of the Hospital de Santa Maria (HSM), a result of the collaboration between the two proponent Institutions. This has allowed the inclusion of exercise specialists in the obese adolescent' consult of the HSM, leading to an unusual (Fonseca et al, 2008), but surely necessary (Barlow et al, 2007), multidisciplinary program where, in the same Unit, adolescents are evaluated and receive medical, dietary and physical activity counselling. In compliance with the latest recommendations (Oude Luttikhuis et al, 2009), we use behavior change techniques directed not only to the adolescent but also to their parents, using the self-determination theory (SDT) rationale and motivational interviewing techniques (Teixeira et al, 2012), a treatment protocol that has been recognized by the Society for Adolescent Medicine (Fonseca et al, 2010).