Inclusion and exclusion criteria

1. 40 years of age1. COPD exacerbation in the previous month
2. Diagnosis of COPD (defined by FEV1/FVC <0.70, or computed tomography evidence of emphysema, or prior documentation of FEV1/FVC <0.70 and clinical evidence of COPD (≥10 pack-years cigarette smoking history, dyspnoea or on bronchodilators))2. Inability to ambulate with or without assistance
3. Medical clearance from a healthcare provider to participate in an exercise programme3. Clinical signs of unstable cardiovascular disease or congestive heart failure
4. Access to a computer with an internet connection, a USB port or Bluetooth capability, and Windows XP/Vista/7/8/10 or higher, or Mac OSX 10.5 or higher operating system, or willing to come to VA Medical Center to use study computers4. Hypoxaemia during 6MWT, i.e. oxygen saturation <85%, with or without using supplemental oxygen
5. Pedometer with >90% accuracy compared to manual counts on a short clinic walk5. Inability to complete questionnaires
6. Competent to provide informed consent6. Inability to collect at least 7 out of 10 days of baseline step counts
7. Willingness to make return visits and be available by telephone for duration of study7. Participation in a pulmonary rehabilitation programme at time of screening or within the previous 3 months
8. Participation in another exercise-related research study at time of screening
9. Plans to participate in an exercise-related research study in the next 12 months
10. Plans to enrol in a supervised exercise programme, such as pulmonary rehabilitation, in the next 6 months
11. Average daily baseline step counts ≥10 000 steps per day

FEV1: mean forced expiratory volume in 1 s; FVC: forced vital capacity; 6MWT: 6-min walk test.