Halasana
In Sanskrit, Hala means "plow" and Asana means "pose" or "seat." This Asana translates to Plow Pose. This pose is typically preform during the end of a practice and is a good preparatory practice to Sarvangasana or Shoulder Stand Pose.
This pose is best preformed during the end of a Yoga Asana sequence because of the ability to experience a state of Pratyahara meaning "withdrawal of the five senses."
Practice
Lie flat on the back with the legs and feet together.
Inhale placing the arms beside the body with the palms facing down.
Hold the breath while raising both legs to the vertical position, keeping them straight and together, using only the abdominal muscles.
Press down on the arms and lift the buttocks, rolling the back away from the floor.
Lower the legs over the head.
Try to touch the toes to the floor behind the head.
Do not force the toes to touch the floor.
Turn the palms up, bend the elbows and place the hands at the hips
Inhale relaxing and hold the final pose for as long as is comfortable.
Hold the breath while returning to the starting position by lowering the arms with the palms facing down, then slowly lower the back and buttocks to the floor.
Raise the legs to the vertical position.
Using the abdominal muscles, lower the legs to the starting position, keeping the knees straight.
The six cleansing actions are intended to be the start of a Yoga practice in order to clean, strengthen, remove toxins and improve the flow of Prana through out the practitioner.
Yoga poses help to elongate and strengthen the muscles of the body as well as to calm the mind for the deeper spiritual practices of Yoga.
Breathing exercises are a great practice to remove carbon dioxide, increase lung capacity as well as being a good preparatory practice for the deepest spiritual practice of Yoga, Meditation.
The four body locks that makes up this practice give the practitioner the ability to hold or lock Prana in certain locations of the body. These practices also allow the practitioner to release blockages that may be holding the practitioner back.
The gestures in this practice include the whole body and are intended to awaken Prana, Chakras as well as Kundalini energy within the practitioner.
Meditation is the highest spiritual practice of Yoga which is why this practice is the most difficult practice to preform, but with correct knowledge and dedication, can be the most profound practice of Yoga.