Baseline assessments prior to commencing PR will include symptom and quality of life assessments including Borg scale for assessment of breathlessness, Chronic Respiratory Questionnaire (CRQ), COPD Assessment Tool (CAT) and the Hospital Anxiety and Depression score (HAD). A 6 minute walk test (6MWT) will be carried out as this is a widely used and well validated tool to measure exercise capacity. A handheld dynamometer will be used to obtain more detailed measures of quadriceps muscle strength. In addition we will measure activity at home during and after PR using pedometers as this has never been investigated previously.These are simple devices that can be attached to patients and count the numbers of steps during a day and therefore provide an estimate of activity in the home environment. A yamax Digi-walker SW-200 pedometer will be used to count the number of steps taken per day. Patients will be instructed to wear the device on left side of the body all the time, except when sleeping or showering. Pedometer placement was standardised by placing it on the belt or waistband, in the midline of the thigh, consistent with the manufacturers recommendation and with other studies conducted previously. Patients will be record daily step counts on daily diary cards until their final follow up.