What is the name of this ninja movie from the 80's early 90's?

I don't remember any of the actors in it. I think it was made in the 80's or early 90's, that's when I watched it. There's a woman aerobics instructor, she somehow becomes possessed or something and becomes an evil ninja, haha, and there's this cop following her because he suspects her of wrongdoings...? I remember once scene in particular where the woman and cop have an intimate moment with tomato juice...she like, pours it on herself and he licks it off of her. As I type this, I realize that this is a really retarded movie and the title shouldn't matter, but I was just thinking about it the other day. Surely someone else knows what I'm talking about.