Table 2.

Features of the ‘My Exercise Messages’ app mapped to behaviour change techniques [46]

Feature within the app	Behaviour change technique
Input a weekly exercise goal (target)	Goal setting (behaviour)
Messages/function to record weekly exercise sessions	Prompts/cues Self-monitoring of behaviour
Graph displaying weekly exercise sessions, relative to the exercise goal (target)	Review of behavioural goals Feedback on behaviour Discrepancy between current behavior and goal
Motivational/praise/encouragement messages when the exercise goal (target) is achieved	Social reward
Message acknowledging partial achievement of exercise goal (target) where appropriate	Social reward
Selection and input of main exercise barrier when exercise goal (target) not achieved	Problem solving
Tailored messages with tips to overcome reported exercise barrier†	Goal setting (behaviour) Problem solving Goal setting (outcome) Action planning Self-reward Restructuring the physical environment Distraction Verbal persuasion about capability Focus on past success Self-talk Feedback on behaviour Self-monitoring of outcome(s) of behaviour Social support (unspecified) Instruction on how to perform behaviour Behavioural experiments Information on health consequences Prompts/cues Habit formation Graded tasks
Generic regular messages to facilitate ongoing exercise adherence	Information on health consequences Self-reward Instruction on how to perform behaviour Social comparison
Reducing frequency of messages as the program progresses	Reduce prompts/cues
Benefits of exercise and physical activity for osteoarthritis information section	Information on health consequences Instruction on how to perform behaviour

^†Note- users do not necessarily receive messages containing all behaviour change techniques, as messages sent are dependent on the barriers reported by users