Cat runs laps in house! Help!?

I got a cat from a pound rescue last year and she has been fixed, and all of her immunizations, etc. She is completely healthy, maybe a little overweight now but that's it. She has lately begun to constantly run laps through my condo. I cannot get her to stop. She has injured all of us, because she runs over our feet and causes deep scratches. Its a compulsive thing that she does all day long and we are sick of it! What can be done? She has plenty of toys and scratching posts.