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  1. Exercise and chronic disease: Get the facts - Mayo Clinic

  2. Physical activity, exercise, and chronic diseases: A brief review

  3. Get the facts on exercise and chronic disease

  4. Exercise Intolerance: Causes, Symptoms, and Treatment - WebMD

  5. Exercise Intolerance: Signs, Causes, Diagnosis, Treatment

  6. Exercising With Chronic Conditions - National Institute on Aging

  7. Exercise for adults: Terminology, patient assessment, and ... - UpToDate

  8. Cardiac exercise stress testing: What it can and cannot tell you

  9. Clinician’s Guide to Cardiopulmonary Exercise Testing in Adults:

  10. Heart disease - Diagnosis and treatment - Mayo Clinic