Ninja III: The Domination (1984)

Director: Sam Firstenberg
Cast: Bob Craig, Dale Ishimoto, David Chung, James Hong, Jordan Bennett, Lucinda Dickey, Pamela Ness, Shô Kosugi

Synopsis:

A female aerobic instructor is possessed by the soul of a fallen ninja when coming to his aid. The spirit seeks revenge on those who killed him and uses the instructor’s body to carry out his mission. The only way the spirit will leave her body is with the help of another ninja.