Role of Exercise in PRISm and Subsequent Development of COPD

This study is investigating whether exercise can help prevent people with a specific breathing pattern called PRISm (preserved ratio impaired spirometry) — where lung function is reduced but the ratio of two breathing measurements is normal — from developing COPD. PRISm is considered a transitional state between healthy lung function and full COPD. **You may be eligible if...** - You are 18 years of age or older - You are a current or former smoker - Your breathing test (spirometry) shows the PRISm pattern (FEV1/FVC at or above 0.7 but FEV1 below 80% predicted) - You are able to walk without assistance - You can provide informed consent **You may NOT be eligible if...** - You are under 18 - You have never smoked - Your spirometry does not show PRISm, or you are unable to perform a spirometry test - You need help walking - You are unable to give informed consent Talk to your doctor to see if this trial is right for you.