"The Key of Happiness: Sudarshan Kriya" is a practice from the Art of Living that involves rhythmic breathing techniques aimed at reducing stress, enhancing mental clarity, and promoting overall well-being. Developed by Sri Sri Ravi Shankar, this powerful breathing technique harmonizes the body, mind, and spirit, leading to deep relaxation, emotional balance, and a greater sense of inner peace. It's widely recognized for its effectiveness in relieving anxiety, boosting energy levels, and fostering a positive outlook on life.