Ron Galella, Ltd./Ron Galella Collection via Getty; Getty

“He was about to shoot that movie.

“It was an intelligent conversation.

I said I really appreciate you thinking of me.

Fitness guru Susan Powter attends the 1994 National Association of Television Program Executives (NATPE) Convention on January 27, 1994 at Miami Beach Convention Center in Miami Beach, Florida; Kevin Costner in Waterworld

Susan Powter in 1994 and Kevin Costner in ‘Waterworld’.Ron Galella, Ltd./Ron Galella Collection via Getty; Getty

It’s a movie, I’m not going to be a jerk.

We were talking about doing it, we were talking about the role.

I said, ‘[The character is] just not who I am.’

Kevin Costner and Dennis Hopper in Waterworld

Kevin Costner and Dennis Hopper in ‘Waterworld’.Universal/Getty

I’m passionate; I’m not angry.

There’s a difference.”

Powter says that’s when “things started to change” between herself and those who worked with her.

“My manager was livid because she wanted the movie.

She wanted me to do a movie,” she says.

“[She thought] it would’ve been a great thing for me.”

“I was not in any way affected by it.”

“I’m not angry.

The opening line ofStop the Insanity!is I am not angry; I’m passionate.

That’s a very deliberate line.”

Universal/Getty

Representatives for Costner have not returned EW’s requests for comment.

Check back with EW for more from our interview with Powter.