This resource provides the instructor with a video clip illustrating conservation of energy in a circus routine. Along with the video clip are questions that the teacher can use to hold a class discussion to help students understand how one form of energy can be transformed into another form of energy. After the discussion, there are three activities that can be performed to help reinforce the concepts behind the Law of Conservation of Energy. This review only covers the video clip, discussion questions, and first activity: Rubber-Band Machines. In the activity, students are to create a simple device that will convert elastic potential energy of a rubber band into kinetic energy so as to launch a marshmallow to the highest possible height.