Usability and Acceptability Study of the P-STEP Mobile Application

Inclusion Criteria: * Adult ≥ 18 years * Live within the boundaries of the test site (Leicester, UK). * Diagnosed with one (or more) of the following conditions: asthma, chronic obstructive pulmonary disease (COPD), interstitial lung disease (ILD), coronary heart disease (CHD), heart failure (HF), type 2 diabetes * Android smartphone which has access to the internet * Can walk outside for a minimum of 5 minutes without feeling uneasy/unsteady * Available to pilot the app for 12 weeks from August-December 2023 * Able to give informed consent to participate in the evaluation Exclusion Criteria: * English language restriction * Advised not to do exercise by a health care professional, in the last 12 months. * Access to an iOS smartphone only * Diagnosed with dementia, learning disability, mental health disorders (other than depression or anxiety), epilepsy * Receiving palliative care * Pregnant * Chest pain at rest * Unsteady when standing or walking * Current cancer patient * Part of the P-STEP User Engagement group