When metal gets infused into a yin practice there are more straight lines as well as contracting and rigidity. While we hold a pose for some time it is stop and start. So while we still have time in the pose but it isn't steady like earth rather touch and go. The emotion connected to the metal element is sadness/grief which we talk more about in the practice. No props are needed for this class. Metal gives birth to water which is the next suggested practice.