Inclusion Criteria:  PD patients who have been identified as candidates for DBS. Ability to give informed consent. Patients ages 18 years and older.  Exclusion Criteria:  Participants will be excluded if they have ongoing orthopaedic conditions potentially impacting on global mobility. Participants who live >50km from downtown Toronto. Participants with severe cognitive deficits ((Montreal Cognitive Assessment (MoCA) score <17). Participants who are already receiving physiotherapy treatment (or that has been receiving it during the three months prior to enrollment) will be excluded from the study.