Table 1 Self-regulatory BCTs provided in the Phys-Can RCT

Goal-setting

Participants wrote specific weekly behavioural goals (exercise frequency, intensity, time and/or type) in electronic or printed training logs.

Review of behavioural goals

Participants reviewed their behavioural goals with their study coaches to check if those goals were reached. Adjustments were made when needed.

Self-monitoring

Participants recorded each training session in electronic or printed training logs. The logs included reflective notes regarding their exercise experiences, thoughts and feelings.

Action planning

Participants made exercise plans with their study coaches specifying when, where and how to exercise.

Problem solving

Participants analysed their training logs with the study coaches and identified strategies to overcome barriers. They also developed a plan for relapse prevention, including goal-setting and coping planning. This plan was written; one copy for the participant and one for the coach to follow-up.

Follow-up prompts

Participants were followed up by their study coaches at 3 and 9 months after the exercise intervention. The individual plan for relapse prevention, including goal-setting and coping planning, was reviewed and revised at these occasions.