Is Gait Speed and Sarcopenia Prognostic in Chronic Respiratory Disease?

Inclusion Criteria: * All patients with chronic respiratory disease who are able to complete the assessments. Exclusion Criteria: * Significant co-morbidities that would limit walking ability, exercise capacity or make exercise unsafe (e.g. unstable ischaemic heart disease, neuromuscular disease, severe hip/lower limb joint pain, peripheral vascular disease, lower limb amputation). * Any patient whom the Chief Investigator feels it is unsafe to exercise (e.g. unstable cardiovascular disease).