What do you feel would be the most helpful in preparing you to instruct a group exercise class?

Hi! I instruct a group exercise leadership course at a technical college. The course curriculum does include book/lecture components but I am looking to amp up the class this semester and incorporate more practical hands on assignments/activities. Thinking back to when you first started teaching, what do you feel would be a helpful activity to help better prepare you to instruct a class? Thanks in advance for your thoughts!