Patients will wear all four activity monitors (three DirectLife and one Actigraph GT3x) simultaneously in their daily routine, for a period of at least 10 hours/day during the evaluation period of one week. After this monitoring period, they will answer a simple questionnaire about the feasibility of using DirectLife in day-to-day including questions such as: which position(s) they considered as the best position to wear DirectLife, how easy was to put it on and whether the use of DirectLife interfered or not in their daily routine. At the end of this WP we will be able to establish the best position to use the DirectLife and this position will be used in the WP2. If one site is not favoured over the others for monitor position, we will ask patients to wear DirectLife at the place they judge as the most comfortable. If DirectLife does not provides an accurate measurement of patients' physical activity, we will ask them to wear the device in the pocket (position that the manufacturer states it is the best to wear it).