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When you’re undertaking the challenging Extended Triangle Pose, it’s helpful to remember that there’s a reason for the name of the pose: In it, your body forms various-sized triangles—the larger triangle between your front and back legs and the floor as well as the smaller triangle between your arm, front leg or the mat, and side body.
Utthita Trikonasana brings about grounded stability and a heart-opening expansion of the chest. It stretches the hamstrings and back muscles while activating the abdominal muscles. It’s a pose that requires concentration, body awareness, balance, and a steady breath, which can help focus a wandering mind and bring you back to what’s happening on your mat.
It doesn’t appear, at first glance to be a challenging pose. But it is incredibly easy to practice it in a way that’s unsafely or suboptimally aligned. “When I first attempted Triangle, I thought that if I could reach my hand to the floor—voila!—I was done,” says senior Iyengar instructor Marla Apt. “I was not yet aware that in reaching to the floor, I had sacrificed the alignment of other body parts. I had yet to learn to use my muscles to support me so that I had a strong foundation from which to extend.”
Utthita Trikonasana (oo-TEE-tah trik-cone-AHS-ah-nah)
utthita = extended
trikona = three angle or triangle
If it isn’t possible to comfortably settle into the traditional version of Extended Triangle Pose, there are ways that you can make the pose more accessible:

If you can’t reach the floor without twisting or rounding your back, place a block beneath your shoulder inside your front ankle. Adjust the height of the block to whatever level feels comfortable for you.

Rest your bottomo hand on the seat of a chair rather than your shin or the gr0und for added stability and better balance. Or, flip the chair around and rest your hand on the back of the chair rather than the seat.

Sit toward the edge of a chair. Carefully move one leg out to the side and straighten your knee. Rotate that thigh externally so your knee faces the ceiling and bring that side hand onto your shin or thigh. Reach up with your other arm. You can look up toward your fingers if that is comfortable for your neck.
Pose type: Standing
Target area: Hips
Benefits: Extended Triangle Pose improves balance, posture, and body awareness. It counteracts the effects of prolonged sitting.
Other Extended Triangle perks:
“When I realized I was actually creating a series of small triangles with my body when I engaged in this pose, I became much more deeply attuned to it,” says Yoga Journal contributing editor Gina Tomaine. “I found this concept charming and appealing. Those tiny triangles were something pleasant and simple for my mind to focus on—which made the physical challenge feel easier.”
These tips will help protect your students from injury and help them have the best experience of the pose:
Ardha Uttanasana (Standing Half Forward Bend)
Virabhadrasana II (Warrior II)
Prasarita Padottanasana (Wide-Legged Forward Bend)
Parsvottanasana (Intense Side Stretch Pose)
Uttanasana (Standing Forward Bend)
Viparita Virabhadrasana (Reverse Warrior)
Paschimottanasana (Seated Forward Bend)
In Trikonasana, the front leg hamstrings and the gluteal maximus are the focal point and receive a powerful stretch, explains Ray Long, MD, a board-certified orthopedic surgeon and yoga instructor. The pose also stretches the upper-side abdominal and back muscles, as well as the back leg gastrocnemius and soleus muscles.
In the drawings below, pink muscles are stretching and blue muscles are contracting. The shade of the color represents the force of the stretch and the force of contraction. Darker = stronger.

Notice how straightening the curve of the upper-side back increases the stretch of the front-leg hamstrings. This is because engaging the upper-side quadratus lumborum muscle tilts the pelvis slightly forward, lifting the ischial tuberosities. You can see the connection of the rotation of the trunk upward and the movement to the hamstring muscles.

Activating the quadriceps straightens the knees. Contracting the buttocks opens the front of the pelvis. The front of the pelvis also opens as the back hip externally rotates. You can activate the gluteal muscles and the quadriceps of the back leg by attempting to drag the back foot away from the front but without actually making any visible movement. Because the foot remains fixed on the mat and cannot move, the force of this action is transmitted to the back of the knee on the rear leg, opening this region.
The tendency is for the front knee to turn in as the body turns up. Counter this tendency by externally rotating the hip to keep the knee facing forward. Press the ball of the foot into the floor to create a helical force up the leg. This illustrates the principle of co-activating muscles to create stability.

The lower hand is fixed on the floor or leg, giving leverage to open the chest. The engagement of the upper side shoulder and upper arms create proprioceptive awareness of the arm in space. The cervical spine rotates the head to face upward.
Excerpted with permission from The Key Poses of Yoga and Anatomy for Vinyasa Flow and Standing Poses by Ray Long.
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7 Poses to Release Those Tight Hamstrings
Teacher and model Natasha Rizopoulos is a senior teacher at Down Under Yoga in Boston, where she offers classes and leads 200- and 300-hour teacher trainings. A dedicated Ashtanga practitioner for many years, she became equally as captivated by the precision of the Iyengar system. These two traditions inform her teaching and her dynamic, anatomy-based vinyasa system Align Your Flow. For more information, visit natasharizopoulos.com.
Ray Long is an orthopedic surgeon and the founder of Bandha Yoga, a popular series of yoga anatomy books, and the Daily Bandha, which provides tips and techniques for teaching and practicing safe alignment. Ray graduated from the University of Michigan Medical School and pursued post-graduate training at Cornell University, McGill University, the University of Montreal, and the Florida Orthopedic Institute. He has studied hatha yoga for over 20 years, training extensively with B.K.S. Iyengar and other leading yoga masters, and teaches anatomy workshops at yoga studios around the country.