The Lower Body and Stand on One Leg (下势独立 Xià shì dúlì) is a posture found in t'ai chi ch'uan. It's comprised of two main elements: The Snake Creeps Down (Single Whip Squatting Down) and the Golden Rooster Stands on One Leg/Golden Bird Standing Alone. This step consists of a first "Golden Rooster" with left leg as lead, followed by a "Snake creeps down", from which another "Golden Rooster" is performed, bu this time the lead leg is the Right one, to which a final "Snake creeps down" comes to finalizing the movement.
The Lower Body and Stand on One Leg is an relatively dificult posture to learn to beginners, since it requires mastering Du li Bu and Pu Bu stances, while mantaining fluidity, stability and coordination.
This posture uses a sort of P'eng (Warding Off) application and the Chung Ting (Central Stance) transitioning to the Chin Pu (Forward Stepping) movements.
The Golden Rooster Stands on One Leg/The Golden Bird Standing Alone Edit
You Must asume the Du Li Bu Stance (lead leg is lifted with the knee bent, at waist height), while the lead hand is placed near the center midline in a palm hand (palm looking to the other side), the back hand is located at wais height and later traised to shoulder hand, arm almost fully extended and the hand is put in a "beak" pose, during the transition to The Snake creeps down pose.
The Snake Creeps Down Edit
From the Golden Rooster Stands on One Leg Stance, the practicioner sends his lead leg in the air to the ground to perform a Pu Bu stance, while his lead arm moves through the ground (without touching it) towards the lead feet, once reached, following a circular movent the lead hand moves with the full reached arm to rest in a frontal palm at shoulder height, while this is performed the Pu Bu stance transforms itself into a Gong Pu stance. The back arm in "Beak hand" come to rest parallel to the back leg during the transition to Gong Pu.