Table 1.

Behaviour change techniques.

Theoretical component	Description
Self-efficacy (self-monitoring strategies)	Participants will record their behaviour using exercise diaries. The act of keeping daily records requires conscious thought about activity levels and serves as a reminder to exercise [24]. Additionally, participants will weigh themselves weekly to promote weight loss and reduce the risk of weight regain [17,25].
Goal setting	During the first week of the intervention, participants will receive their results from baseline testing (excluding questionnaire data) to assist in setting relevant goals. Participants will then be taught goal-setting techniques [26] and instructed to set at least one goal specific to exercise. Goals and progress will be reviewed by the participant and PI every three weeks. Participants will be introduced to the ‘body weight planner’ (https://www.niddk.nih.gov/health-information/health-topics/weight-control/body-weight-planner/Pages/bwp.aspx); a web-based energy balance prediction model for setting realistic goals for weight loss and weight-maintenance [27].
Relapse prevention	Problem solving and coping strategies will be addressed by discussion [28,29].
Outcome expectancy	Participants will be aware of, and given realistic expectations of the potential benefits of exercise, such as improved fitness and weight loss, to reduce rate of attrition [21,30].
Education and skill development	Participants will be given instructions, feedback and guidance about use of exercise equipment, exercise technique, and recognising cues for injury avoidance. Participants will also be familiarised with basic concepts in nutrition such as the Australian Dietary Guidelines and portion size control [31] and encouraged to visit the UQ St Lucia Dietetics Practice.
Prompting	Participants will be sent email/SMS reminders to attend their supervised exercise sessions. After their session, participants will be prompted to incorporate some active transport or active leisure time each week. During phase 2, participants will be reminded to complete the required dose of unsupervised exercise.
Encouragement and support	Participants will be regularly asked about their progress and any potential barriers to exercise will be identified and methods to help overcome them will be discussed.
Environment	During the supervised exercise sessions, music will be played to increase motivation and exercise performance [32]