Any activity that gets students involved is very useful and makes the learning experimental. This includes e.g. small group discussions, role play, writing or drawing something specific, skits etc.
Activities that involve getting up and moving about can also keep students energized. Try to use a variety of teaching materials and methods and do not forget individual differences of your students. It is known that individual differences increase with age. Take into account that your students have a lot of life experience which they can bring to the classroom, provide them as many opportunities for dialogue as possible and ask open-ended questions so that they can use their knowledge and experience. Treat all questions and comments with respect. Tell your students the expectations of the teaching process and familiarize them with the syllabus, but do not be disappointed when they do not completely agree with your plan. You can discuss it together and make some changes in accordance with the needs of your students. They can help you to design the learning process. Because adult students are problems centred, let them know how the newly acquired knowledge can be used in specific situations. As a teacher, you should balance between presentation of new material, discussion and participation among students and your course plan. Teaching strategies for adults are more effective if it is learner-centred than instructor-centred.