i usually have stiff feet first thing in the morning. After a few steps they get better, but lately i feel like my feet are stiff after i have been sitting even for a short time. i am also have some knee ache. I am 47 years old, slightly over weight but not extreme. I am a female. I don t have any other health problems. My blood pressure is normal and otherwise pretty healthy person with no issues. I get restless legs at night and take 1/2 a tablet of mirapex to help ease that for sleep. Otherwise i am on no medications. advice on what could be causing this?