I came home and typed up a lesson plan, compared muscle groups used in strength training versus yoga moves to ensure a full-body workout, found a suitable musical selection. Pretty much everything short of actually doing the workout myself.
The following week we did the workout. They loved it!
I was sore for three days and wanted to die.
The middle aged women reported no soreness, and unanimously voted to continue doing the ultimate workout at every class from now on. Oh, in the name of God! I have created a monster and it will destroy me!