working out with arthritis

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i am 24 years old and i have really bad arthritis in my knees hips and back. when i work out it causes alot of pain. does anyone know of any works outs i can do at home that will not cause so much pain. and if there is anyone else who has to deal with the pain of this please feel free to add me because i would love to have friends that know what i am fighting against when i do work out...