1. Harvard Health Publications—Harvard Medical Schoolhttps://www.health.harvard.edu/healthbeat/stretching-and-strengthening-are-key-to-healing-and-preventing-back-pain
2. WebMD—Exercise to Treat Arthritishttp://www.webmd.com/osteoarthritis/exercise-treat-arthritis#1
3. WebMD—Flexibility Exercises to Help Your Rheumatoid Arthritishttp://www.webmd.com/rheumatoid-arthritis/features/flexibility-exercises-for-ra#1
4. Harvard Health Publications, Harvard Medical School—Everyday Stretchinghttps://www.health.harvard.edu/everyday-stretching
5. FitClick; How Many Calories Burned–Stretchinghttp://www.fitclick.com/calories_burned?Stretching&oc=751#.WYD7BDp0zIU