Purpose: The aim of this pilot study was to evaluate the potential value of a new personalized activity-based feedback treatment. Method: A prognostic cohort study was carried out in the daily environment of the patients. Seventeen individuals with chronic lower back pain (CLBP) symptoms for 43 months were included. Patients were from the Netherlands, aged 18–65 years. Patients wore an accelerometer and a Personal Digital Assistant (PDA) for 15 d. Patients received continuous and time-related personalized feedback and were instructed to follow the activity pattern as displayed on the PDA. Technical performance and compliance with the system were rated. Objective and subjective activity scores were compared for exploring awareness. The absolute difference between the activity pattern of the patient and the norm value used was calculated and expressed as mean difference. Pain intensity was measured using the VAS. Results: The technical performance and compliance with the system were rated moderate. More than half of the patients were aware of their activity level during the feedback days (67%). A positive effect of the feedback was seen in a trend which showed a decrease in the absolute difference between the activity pattern of the patient and the norm value (p=0.149) and a significant decrease in pain intensity levels (p=0.005). Conclusions: This pilot study suggested that an individual-tailored feedback system that focuses on the activity behavior of the patient has potential as the treatment of individuals with CLBP.