Utthita = Stretched/Extended, Parsava = Side Kona = Angle, Asana = Pose or Posture

Utthita Parsvakonasana is a great pose for strengthening and toning the body. 

Steps:

Stand in Samasthiti Asana (Mountain Pose) with your feet together and your arms relaxed at your sides. Take a deep breath two times.

There are 8 steps in this posture which is the equivalent of doing Utthita Parsvakonasana (Extended Triangle Pose /Extended Side Angle Pose) one time.

Step 1: Inhale, jump and bring your legs apart, keep your hands at shoulder level, with the palms facing the ground. Keep the arms parallel to the floor.

Step 2: Turn your left foot 90 degree and right foot slightly inwards,

Step 3: Exhale, bend the left leg at the knee until the thigh and the calf form a right angle and the left thigh is parallel to the foot.

Place the left palm on the floor by the side of the left foot, the left armpit covering and touching the outer side of the left knee.

Stretch the right arm out over the right ear and bring your gaze up toward your right hand and hold for few seconds

The chest, hips, and legs are in one line, move the chest up and back. Stretch every part of the body, concentrating on the back portion of the whole body, especially the spine.

Step four: Inhale and lift the left palm from the floor and raise the arms

Step five: Retain your breath, turn right foot 90 degree and left foot slightly inwards

Step six: Exhale, bend the right leg at the knee until the thigh and the calf form a right angle and the right thigh is parallel to the foot.Place the right palm on the floor by the side of the right foot, the right armpit covering and touching the outer side of the right knee.Stretch the left arm out over the left ear and bring your gaze up toward your left hand and hold for few seconds

Step seven: Inhale and lift the right palm from the floor and straighten the leg and raise the arms

Step eight: Exhale, jump and bring your feet together just like the starting position.

Repeat this process 2 to 3 more times as needed

Tips 

If you have any pain on your knees or are not able to go down, you can use the block. Place your hand on a block on the inside.or outside of the foot depending on what feels best for your body and bend on your sides.

Benefits of Utthita Parsvakonasana (Extended Side Angle Pose)

1. Regularly practicing utthita parsvakonasana may help in toning knees, ankles and thighs
2. It helps to reduce the  fat around the hips and waist.
3. This pose also stimulates the abdominal organs, eases cramps, and increases stamina.
4. It also opens the chest and shoulders, which can be beneficial if you have any stiffness in your shoulders or back. 
5. It may help in providing relief from sciatica.