I agree, my lecture does not change each time but gets more enhanced.

A few of us instructors have gotten together and joined a gym to work out together after work each day. This has helped us all in reducing our stress levels.

I like to constantly update my course materials based on feedback from students and managers a like. I feel that my course in in a constant state of improvement.

I like to start each new class with the exact expectations that I have for them, and then keep them posted on thier progress on thier achievments. I find that the students thrive on this and are more relaxed.

I think you have to be ready to change with the class mood and style. Certain classes react different on Mondays then they do on Fridays. Be ready to change your lesson plan at a moments notice and adapt your style in order to react to the class condition.