Table 2 List of behaviour change techniques included in design of feasibility study

1.1—Goal setting (behaviour)

For participants to participate in a virtual online exercise session twice a week. Sub goals based on self-identified activities of choice

1.2—Problem solving

Identify potential barriers to taking part in the study and generate individualised solutions to help overcome barrier—can be iterative process as intervention proceeds. Group knowledge and discussion sessions used to work through barriers or negative emotions/thoughts in respect of activity

1.3—Goal setting (outcome)

To be more willing to be more active (even with pain) at the end of the study

1.4—Action planning

Intensity of intervention determined from initial visit with physiotherapist. Sessions planned in accordance with established prophylaxis regime (safety planning). Discuss with each participant what their trough levels would be the day after prophylaxis (enable reasoned process if pain worse and fear of bleed). Encouragement to wear splints, supports etc. if they feel they need to

1.5—Review behaviour goal(s)

Weekly review of attendance and participation in intervention—amend/revisit initial goals setting if newly identified issues

2.2—Feedback on behaviour

Feedback and recap by physiotherapist at end of each week’s activity

2.3—Self monitoring of behaviour

Weekly reflective diary on own activity and pain—to include RPE scale with activity each week

2.7—Feedback on outcomes of behaviour

Feedback at study end of before and after results of outcome measures

3.2—Social support (practical)

Participant partner/family/neighbour will be used if necessary to help in setting up the webcam if necessary—as well as being someone to call upon if any issues such as risk of falls etc

4.1—Instruction on how to perform behaviour

Participants will have practice session for exercises on their list—as well as set up instructions for webcam visuals, plus using diary

5.1—Information about health consequences

Providing information on joint damage and pain in haemophilia and benefits of physical activity/exercise

5.4—Monitoring of emotional consequences

Encouraged to discuss worries/fears whilst taking part in study (focus on pain and activity) and weekly diary

6.1—Demonstration of the behaviour

Each exercise set and start point will be agreed upon at initial visit with explanation and practice demonstration within boundaries of individual ability. Physiotherapist will demonstrate each exercise within the session before each set

7.1—Prompts and cues

Laminated RPE scale next to webcam so can look and answer physiotherapist when asked about this in activity session

8.7—Graded tasks

Exercise activity has graded allowances built-in (more reps, harder/easier effort level)—and will be increased weekly depending on performance

9.1—Credible Source

Intervention will be delivered by expert haemophilia physiotherapist, known to the participant

9.2—Pros and cons

Discussions in initial visit to encourage individual to identify pro’s and con’s to taking part in this study—which are noted in the individual case report form and discussed with physiotherapist

12.1—Restructuring the physical environment

Encouraged to create a place of quiet for them to do their exercise session—and where they can have their laptop/tablet webcam so as to be able to take part with best view for all

12.5—Adding objects to the environment

Thera-band and paper diaries and RPE scale

13.2—Framing/ Reframing

Suggest participants view intervention as a physical activity enabler rather than changing their pain

15.1—Verbal persuasion about capability

Positive reinforcement following initial assessment visit and in all sessions—intervention will be delivered in accordance to their abilities