Motivation and Adherence

Motivation is not a fixed trait but the process that starts, guides and sustains a behaviour, and its quality matters as much as its quantity. Self-determination theory (SDT) distinguishes autonomous motivation, doing something because it is valued or enjoyed, from controlled motivation, doing it under external pressure or guilt. Autonomous motivation predicts sustained behaviour, so exercise driven by personal goals outlasts exercise done only to please a clinician. SDT identifies three basic needs that support autonomous motivation: autonomy (a sense of choice), competence (feeling able) and relatedness (feeling supported). Closely linked is self-efficacy, a person's confidence that they can perform the behaviour, which is an important predictor of adherence. A widely used framework in UK behaviour change practice is the COM-B (Capability, Opportunity, Motivation, Behaviour) model, in which behaviour requires capability, opportunity and motivation together: someone may want to exercise yet lack the capability, meaning knowledge or skill, or the opportunity, meaning time, access or support, and all three have to be addressed. The stages of change model, describing readiness from precontemplation to maintenance, is widely used but less well evidenced, and is best treated as a rough guide.

Non-adherence is usually visible in the clinical course rather than declared. It shows as missed appointments, a home exercise programme done inconsistently or not at all, exercises performed incorrectly, or a plateau with the report that the exercises are not working. Patients rarely volunteer that they have stopped, so an open, non-judgemental enquiry uncovers far more than assuming the plan is being followed. The reasons matter more than the fact: low confidence, pain, low mood, poor understanding, a monotonous or time-consuming programme, no sense of progress and weak social support are common and, importantly, modifiable. The opposite pattern also needs recognising: the athlete who over-adheres, training through pain and progressing too fast, which can undermine recovery as much as doing too little. Reading which pattern is present, and the barrier behind it, is the first step.

Assessment is mainly clinical and takes little time. Asking directly how the plan is going, what gets in the way, and how important and confident the person feels identifies the specific barriers to target. A quick tool from motivational interviewing is the importance and confidence rulers: the person rates from zero to ten how important the change is and how confident they feel, then explains their number, which opens a conversation about what would raise it. For rehabilitation, the Sport Injury Rehabilitation Adherence Scale (SIRAS) rates clinician-observed effort and engagement during a supervised session, and does not measure home adherence. Home adherence is gauged from self-report, diaries, or app and wearable data, all of which should be interpreted cautiously and triangulated rather than taken at face value. Screening for low mood is worthwhile when engagement drops, since depression both reduces activity and results from it. The aim is not to label someone adherent or not, but to understand why, so support can be tailored.

No single adherence intervention is consistently superior, so the aim is to tailor a collaborative, multi-component plan to the barriers identified, favouring an autonomy-supportive style over a directive one. Motivational interviewing (MI) is one useful method: a person-centred style that draws out the person's reasons for change, explores ambivalence and strengthens commitment. Shared goals are set together using the SMART principle (specific, measurable, achievable, relevant and time-bound), combining an outcome goal such as returning to sport with process goals such as three sessions a week. Action planning sets out what, when and where; coping planning adds if-then responses to obstacles such as a busy week. Self-monitoring through a diary, app or wearable, with feedback, sustains momentum and makes gains visible, though apps and wearables are best avoided where disordered eating, compulsive exercise or exercise dependence is present. Self-efficacy grows by setting achievable early steps, and adherence improves when a programme is simple, enjoyable, varied and part of daily routine. Social support helps, so involve family, friends, a coach or a group. Because lapses are normal, plans should include relapse prevention: treating setbacks as information rather than failure and agreeing how to restart. These techniques draw on the taxonomy underpinning UK behaviour change guidance, and the Faculty of Sport and Exercise Medicine's Moving Medicine resource offers practical structures for these conversations.

Adherence to a home exercise programme is associated with rehabilitation outcomes after a musculoskeletal injury, though the size of the effect and how it is measured vary between conditions, and adherence may decline during prolonged programmes, when continued loading still matters. Keeping programmes short, clear and progressive, integrating them into daily routine, and giving regular feedback on measurable progress all protect adherence, as does linking the exercises to the milestones on the way back to sport. Involving the athlete in setting and revising goals maintains the ownership that autonomous motivation depends on. In athletes, over-adherence deserves as much attention as under-adherence: the drive that makes someone train hard can lead to rushing, ignoring pain and skipping recovery, so part of the clinician's role is to pace the return. For long-term conditions and physical activity the goal is maintenance: building habits, planning for relapse and sustaining support beyond the initial programme turn a short-term change into a lasting one.

• •Current NICE guidance on individual behaviour change supports goal-setting and planning, feedback and self-monitoring, and social support, and stresses that interventions must both start and maintain change, with relapse expected and planned for.
• •The COM-B model and the wider Behaviour Change Wheel underpin UK practice, framing behaviour as the product of capability, opportunity and motivation.
• •Self-determination theory holds that autonomous motivation, supported by autonomy, competence and relatedness, tends to sustain behaviour better than external pressure.
• •Shared decision-making and a no-blame approach from NICE guidance on medicines adherence transfer usefully to exercise adherence, though they are not direct evidence for it.
• •The Faculty of Sport and Exercise Medicine's Moving Medicine resource provides evidence-based, time-based structures for motivational conversations about physical activity.

• •Adherence is the extent to which someone follows an agreed plan, an active partnership rather than passive compliance.
• •Autonomous motivation and self-efficacy are important predictors of sustained behaviour change.
• •The COM-B model requires capability, opportunity and motivation together, and all three must be addressed.
• •Motivational interviewing, SMART goals, action and coping planning, self-monitoring and social support are the core strategies.
• •A sudden drop in adherence should prompt enquiry about mood and hidden barriers such as pain or fear of movement.
• •Home exercise adherence is associated with rehabilitation outcomes and may decline during long programmes, so plan to sustain it.