Calling good energy with a smile

Why they always look so serious in Yoga? You make serious face like this, you scare away good energy. To meditate, only you must smile. Smile with face, smile with mind, and good energy will come to you and clean away dirty energy. Even smile in your liver. Practice tonight at hotel. Not to hurry, not to try too hard. Too serious, you make you sick. You can calling the good energy with a smile.