Inclusion Criteria:  Adult lung and liver transplant recipients 12 to 18 months post-transplant Presence of 2 or more metabolic risk factors (hypertension, hyperlipidemia, diabetes, obesity)  Exclusion Criteria:  Active cardiovascular disease (recent heart attack, significant coronary artery disease on cardiac catheterization, heart failure, uncontrolled arrhythmias, chest pain, dizziness, or fainting in the last 3 months) Neuro-muscular disease or orthopedic limitations Physically active with ≥ 150 minutes/week of moderate-intensity aerobic physical activity