RecruitingClinical trialInclined Versus Standard Exercise for COPD PatientsThis study is designed to provide information regarding how to improve pulmonary rehabilitation for persons with chronic obstructive pulmonary disease (COPD). Pulmonary rehabilitation is an exercise program for COPD patients that is recommended and benefits some, but not all, patients. The question being studied in this trial is whether during an exercise program, walking on an incline might be better than walking on faster on a flat surface in training muscles so that patients might be less short of breath with exercise.