Table 3.

Text messages and relation to behavior change technique constructs.

Behavior change technique constructs	Text message examples
Social support	“Telling your helpful family and friends about your goals will help you achieve them”
Prompt specific goal setting	“2 serves of fruit every day is an important goal”
Behavior substitution	“Swapping 2 red meat meals for fish is a great way to get healthy sources of protein and fats!”
Prompt self-monitoring of behavior	“Monitor your resistance and aerobic exercise training sessions using the Fitbit watch and app”
Provide information about behavior-health link	“Resistance exercise twice a week increases muscle size and strength, helping you lose weight and keep healthy”
Problem solving	“Are you finding it hard to get 30 minutes of physical activity every day? Start with a smaller amount and build from there. Every little bit helps!”
Provide instruction	“To get more fiber from fruit, keep the skin on and aim for 2 serves per day”