Parsvottanasana comes from the Sanskrit words Parsva meaning side, Ut meaning intense and tan meaning to extend, stretch or lengthen. Hence the name Intense Side Stretch Pose. This pose is also called Pyramid Pose, which emphasizes the powerful foundation and strength created in this pose.
 
Getting into the pose:

1. Starting with the right foot about 3ft in front of your left, toes pointing to the front edge of your mat. Turn your left foot about 60° and square your hips to the front (pulling your right hip back a little and pushing the left forwards)
2. Inhale bring your hands to reverse prayer position behind your back (if this is not possible hold your wrists or elbows) open the shoulders and chest, looking up to the sky. Keep your thigh muscles engaged.
3. Exhale, keeping the shoulders back, fold the body forwards from the hips, reaching the chin towards your shin. Keep working on pulling the right hip back so the hips stay parallel, and keep the spine long.
4. Stay here breathing deeply, focusing on your body alignment.
5. Inhale lift the body up, open out the shoulders looking up to the sky.
6. Exhale, twist the right foot in and the left foot out. Square the hips to the back of your mat.
7. Inhale open the chest up towards the sky stretching up through the torso
8. Exhale folding down from the hips over the left leg, this time working on keeping the left hip pulled back. Relaxing into the posture as you exhale reaching your chin towards your extended leg.
9. Inhale raise the body up

Modifications

• The full version of the pose is performed with the hands behind the back and the palms pressed together in prayer position (Anjali Mudra). If that option is not possible for you, cross your arms behind you grabbing each elbow with the opposite hand. Fold the opposite arm on top when you change leg position.
• If you have a shoulder or wrist injury — or if you would just like to lighten the backward bending aspect of the pose — release your arms forward to the floor instead of reaching behind. Place your hands on blocks (as seen in the picture) if your hands don’t easily rest on the floor.
• If you are having trouble balancing, step your feet slightly wider than hip-distance apart.

 
 
Caution:  Do not practice this pose if you have a hamstring injury. If you have a shoulder or wrist injury, do not practice the full version of the pose. Women who are pregnant and those with back injuries or high blood pressure should practice the pose against a wall. Always work within your own range of limits and abilities. As with any exercise regimen, including yoga, talk with your doctor before practicing.
 

 
Uttanasana, or intense forward-bending pose, is a component of Sun Salutes and vinyasa, as well as, a dynamic part of the transition between standing and Chaturanga Dandasana. In Sanskrit, Ut means Intense, Tana means stretched and Asana means a yogic pose.
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Uttasana is often dismissed as an uninteresting and basic pose; yet it offers a wealth of opportunities to develop muscle actions that support other standing poses like Warriors and Pyramid Pose. Practicing  this foundation pose brings numerous benefits. Uttasana is also an inversion. Albeit a much more accessible inversion than head stand or handstand but with many of the usual benefits and more. Personally, I lovepracticing Uttansana because the weight of the head hanging heavy is enough to give my neck a gentle stretch. The stretch decompresses the spinal joints allowing a little stretch of the muscles and ligaments as well as a burst of nourishment.

How to:

1. Stand in Tadasana (Mountain Pose), hands on hips (feet together or hip width distance apart). Exhale and bend forward from the hip joints, not from the waist. As you descend draw the front torso out of the groins and open the space between the pubis and top sternum. As in all the forward bends, the emphasis is on lengthening the front torso as you move more fully into the position.
   
   2. If possible, with your knees straight, bring your palms or finger tips to the floor slightly in front of or beside your feet, or bring your palms to the backs of your legs (as seen in the picture). If this isn’t possible, use yoga blocks for your hands. Press the heels firmly into the floor and lift the sitting bones toward the ceiling.
   
   3. With each inhalation in the pose, lift and lengthen the front torso just slightly; with each exhalation release a little more fully into the forward bend. In this way the torso oscillates almost imperceptibly with the breath. Let your head hang from the root of the neck, which is deep in the upper back, between the shoulder blades.
   
   4. Stay in the pose for 30 seconds to 1 minute. Uttanasana can be used as a resting position between the standing poses. It can also be practiced as a pose in itself.
   
   5. Bring the hands back onto the hips and reaffirm the length of the front torso. Have a micro bend in the knees for coming up. Press the tailbone down and into the pelvis and come up on an inhalation with a long front torso.

Beginner’s Tip: If you cannot touch the ground, hold onto the backs of the legs wherever the hands fall (except for the knees) or cross the arms in front of the body holding onto the elbows. Let the head hang with gravity. If this is still too intense, take tension off the hamstrings and low back by bending the knees. Working with the breath, try “inhaling, bending”, “exhaling, straightening”. Deepen the Uttanasana pose to  increase the stretch on the backs of the legs, stand in the forward bend with the balls of your feet elevated an inch or more off the floor on a sand bag or thick book or lean slightly forward and lift up onto the balls of your feet, pulling your heels a half-inch or so away from the floor. Draw your inner groins deep into the pelvis, and then, from the height of the groins, lengthen your heels back onto the floor.
 
Caution:  Uttanasana requires patience and practice. It can take a while to reach the deepest variation of the pose. Those with back injuries can practice this pose with bent knees, use a block for support under the hands, or substitute Half Forward Bend instead.