I think constricting anus 100 times and denting navel 100 times in succession everyday is effective to good-bye depression and take back youth. You can do so at a boring meeting or in a subway. I have known 70-year-old man who has practiced it for 20 years. As a result, he has good complexion and has grown 20 years younger. His eyes sparkle. He is full of vigor, happiness and joy. He has neither complained nor born a grudge under any circumstance. Furthermore, he can make love three times in succession without drawing out. In addition, he also can have burned a strong beautiful fire within his abdomen. It can burn out the dirty stickiness of his body, release his immaterial fiber or third attention which has been confined to his stickiness. Then, he can shoot out his immaterial fiber or third attention to an object, concentrate on it and attain happy lucky feeling through the success of concentration. If you don't know concentration which gives you peculiar pleasure, your life looks like a hell.