OptiMuscle - Improving Respiration by Optimising Muscle Function

The primary aim will be to understand whether a digital breathing biofeedback system can improve the outcomes of physiotherapist guided breathing retraining.

Inclusion Criteria: * Ability to stand and walk independently * History of breathing difficulties, such as breathlessness and difficult or laboured breathing for at least previous 6 months. * Clinical diagnosis of dysfunctional breathing, sometimes referred to as breathing pattern disorder. * If participants have co-existing respiratory problems, e.g. asthma, these should not be felt (in the opinion of the referring clinician) to be the cause of the current symptoms of breathlessness. Exclusion Criteria: * Inability to speak and understand English sufficient to read and understand the information sheet and sign the consent form. * BMI \>34 * Currently receiving active treatment for dysfunctional breathing * Received treatment for acute lower respiratory tract infection or asthma exacerbation with last 4 weeks * Significant respiratory co-morbidity (i.e. where the major respiratory diagnosis is not asthma)