Prasarita = Expand or Spread Out.
Pada = Foot.
Uttan = Intense Stretch.
Asana = Pose.
There are many different variations of this posture.
Prasarita Padottanasana will help to release tension through the backs of the legs and also the whole back side of the body.
How to Perform Prasarita Padottanasana
Stand with the feet a metre apart with the outside edges of the feet parallel. Place your hands onto your hips with your elbows pointing out to the side. Inhale and lift your chest as you exhale fold forwards releasing your head towards the ground. Allow gravity to carry your upper body forward, if it is comfortable place your hands to the ground about shoulder width apart.
Breathe slowly for twenty or more complete breaths.