The PEPPER clinical study is a pragmatic randomised trial over a period of 12 months to evaluate the efficacy, in terms of physical activity level, of an intervention based on structured information delivery according to cognitive and behavioural theories, a personalised written physical activity prescription in number of steps per day, a pedometer, and a pedometer logbook similar to diabetes logbooks, in 35 to 74 year old patients with cardiovascular risks factors. This strategy will be compared to the commonly used oral recommendation of physical activity. The primary outcome is the change in total energy expenditure measured by accelerometry over a 7-day period. Secondary outcomes include changes in physical activity levels (International Physical Activity Questionnaire), quality of life (SF-36), blood pressure, weight, waist circumference, perceived obstacles to physical activity, and patient and doctors compliance with the suggested strategy. 140 patients will be recruited and followed up in 15 GP practices. Measures will be assessed at baseline, at 3 months and at 12 months (end of intervention).