Table 1.

Examples of how self-regulation strategies were targeted across the five different types of text messages.

Text message type	Strategies targeted in this type of message	Example	Minimum dose over 6 months			Frequency
			Weight	PA	Diet	Weight	PA	Diet
Self-monitoring of weight	Prompt self-monitoring	If u havent weighed yourself in the last 2 weeks Karen then do it today! Amy	12	N/A	N/A	Biweekly	N/A	N/A
Goal check	Prompt self-assessment of goal attainment	How r u going Karen? Reach ur goal 2 walk 3x30mins? Text me back yes or no. Amy	3	0	0	Once in weeks 6, 18, 24	Maximum 1 per week (participant determined)	Maximum 1 per week (participant determined)
Goal check reply	Provide feedback	Yes example: Fantastic Karen! Regular exercise will help u control ur weight. Remember 2 buy a magazine & reward yourself 4 ur excellent effort. Amy No example: Don’t worry Karen. Think about what got in the way & plan 4 it this week. Work around ur barriers 2 achieve ur goals. Amy	Triggered by participant’s reply			Triggered by participant’s reply
	Prompt self-reward
	Prompt relapse prevention
	Prompt “real-time” planned behavior
	Prompt self-monitoring
	Prompt preparatory and planning behavior
	Prompt barrier identification and solutions
Goal reset	Prompt SMART goal setting	Reflect on ur exercise goals Karen. Eventually u want 2 aim for 7x30mins exercise/week & more is better. Text me back with a new goal! Amy	3	3	3	Once in weeks 6, 18, 24	Once in weeks 6, 18, 24	Once in weeks 6, 18, 24
Cues for planned behavior	Prompt “real-time” planned behavior	Want 2 feel more energised Karen? Make time 2 walk 3x30mins this week & feel the difference. Amy	N/A	0	0	N/A	Maximum 2 per week (participant determined)	Maximum 2 per week (participant determined)
	Prompt self-monitoring
	Prompt preparatory and planning behavior
	Prompt barrier identification and solutions