I hope that people won't view the poses as the purpose of yoga. I think yoga is fundamentally about maintaining a steady breath and alignment of the body in all poses (or asanas) in the pursuit of mindfulness.
Like the mat version that came before, don't forget to give yourself a few minutes of recovery after practice. Feel free to lay down, face up on the floor. But I don't recommend closing your eyes. It helps to be able to see the diapered butt that's guaranteed to plop down squarely onto your face.
Incorporate this "move of the day" into your regular exercise regimen or just take a few minutes to give it a try. Each day will be a different move, so you can do each one back to back or individually.
Don't hide in the back of the room when you're new. Yoga is nothing like that algebra class of your nightmares. You won't be called on if you plant yourself in the front, and it's the best spot to see the teacher.
Leave your sermon at the door. When a person walks into a yoga class, they expect to do yoga. Be careful with your words. Your beliefs are your opinions. Your opinions are your judgments. Judgments do not belong in the yoga room.