Method Sixty-seven primary care participants (mean age= 67.4 years, 70% male) from three Belgian general practices were randomized into three different treatment arms: (1) individual consultation (n=22) with three physical activity contacts with the patient's a general practitioner ; (2) group counseling (n=21) with three physical activity group sessions delivered by a behavioral expert; and (3) a control arm (n=24) receiving no intervention.