Motivational interviewing (MI) is a method of strengthening personal motivation for change, and has been shown to be a promising approach for promoting health behaviour change in a number of contexts including physical activity promotion. MI comprises several techniques used by practitioners to facilitate behaviour change in patients. Some techniques focus on the content of the intervention, whereas others focus on techniques reflect the practitioner's interpersonal style of delivery. One of the primary roles the MI approach is to evoke the patient's arguments for change and to reduce their own arguments for not changing.