This study will investigate whether a structured physical activity promotion programme, delivered alongside standard treatment with tezepelumab, increases the proportion of adults with severe asthma achieving clinical remission compared with standard care alone. Although biologic therapies have improved asthma control for many people with severe asthma, many individuals remain physically inactive, experience reduced exercise tolerance, and continue to report symptoms that affect their quality of life. Physical inactivity may represent a modifiable factor that limits the achievement of optimal health outcomes.

Adults with severe asthma who are starting tezepelumab as part of routine clinical care will be randomly assigned to receive either standard care alone or standard care plus a 12-week physical activity promotion programme. The programme includes an individual consultation, group behavioural support sessions, personalised goal setting, self-monitoring using a smartphone application, and strategies to help participants increase and maintain their physical activity levels. Participants will be followed for 12 months.

The study will compare the proportion of participants achieving clinical remission after 12 months between the two groups. Additional outcomes include objectively measured physical activity, asthma control, quality of life and functional exercise capacity. The findings will help determine whether combining physical activity promotion with biologic therapy improves outcomes for adults with severe asthma and could inform future models of routine severe asthma care.