ReActivate: Physiotherapist Led Intervention for Adolescents With Pain and Psychological Distress.

The study period is 84 days (12 weeks). Depending on the length of the baseline period (randomly assigned to be 7, 14 or 21 days), the treatment period varies between 63-77 days and contains 6-11 sessions. The intervention consists of 2-4 educational sessions in pain mechanisms and fear avoidance and 4-9 sessions of individually tailored intervention with graded exposure and reactivation to avoided physical activities. Intervention will take place from one time per week to one time every two weeks, 30-60 minutes per session. Number of treatment sessions will depend on when the individual participants' goals are considered reached. If necessary, given the participants consent, their legal guardians will be invited to attend the sessions.