Originally published in Yoga Journal’s March–April 1995 archive, the reclining posture Urdhva Prasarita Padasana—known as extended leg raises—serves as a classic diagnostic tool for core strength, body awareness, and the deep psoas muscles. The movement challenges practitioners to lift and lower the legs through a 90-degree arc without destabilizing the pelvis, lower back, or breathing rhythm.
In Plain English: The Clinical Takeaway
- The Psoas Mechanism: The psoas muscles are deep hip flexors originating on the lower spine and inserting on the inner femur, functioning as primary drivers for upright posture and leg elevation.
- Core Stabilization: Proper execution requires isolating hip flexion without tensing the rectus abdominus (superficial belly muscles) or arching the lumbar spine.
The Neurological Geography of the Body Image
Human beings carry an internal map of their physical form, termed the “body image,” which integrates sensory reports from bones, muscles, organs, and circulating fluids. Movement therapist Bonnie Bainbridge Cohen describes these as “tissue territories.” According to Morris Berman in Coming to Our Senses: Body and Spirit in the Hidden History of the West, body image and interiority are inseparable aspects of self-awareness. In modern sedentary cultures, disuse of the body often yields a distorted internal map, reflecting what yogis call avidya, or ignorance of the Self.
When beginner yoga students ask instructors if they are executing a pose correctly, it marks a physical manifestation of this disconnect. Urdhva Prasarita Padasana functions as a tactile mapmaking tool by utilizing the pressure of the back against the floor to activate neglected surface areas.
Mobilizing the Deep Hip Flexors Through Reclining Postures
While Urdhva Prasarita Padasana is frequently mischaracterized as a superficial exercise to firm the rectus abdominus, its primary physiological purpose is to mobilize and strengthen the psoas muscles. Mabel Todd, author of The Thinking Body, identifies the psoas pair as critical determinants of upright human posture. The psoas originates on the sides of the lower spine, crosses the pelvis, and inserts on the lesser trochanter of the inner thigh bone.
When functioning correctly, the psoas unites the upper body with the pelvis and legs. The primary mechanical challenge of the posture is executing the 90-degree arc of the femur within the hip socket without disturbing the pelvis, spine, or diaphragmatic breathing.
Preliminary Exercises for Psoas Activation
To prepare for Urdhva Prasarita Padasana safely, practitioners begin with foundational awareness exercises on the floor. Lying supine with knees bent and feet flat establishes baseline gravitational feedback from the pelvis, shoulder blades, and occiput. Practitioners map the internal distance from the inner groins to the anterior surface of the sacrum, establishing a mental line of tension.
Breath control remains central to the sequence.
| Anatomical Structure | Primary Function | Movement Role in Urdhva Prasarita Padasana |
|---|---|---|
| Psoas Major | Deep hip flexion and spinal stabilization | Primary mover lifting the femur through the 90-degree arc |
| Rectus Abdominus | Superficial trunk flexion | Secondary stabilizer; should remain relaxed rather than gripping |
| Femur (Head) | Ball-and-socket articulation | Rotates smoothly within the acetabulum during leg raises |
Beginning Practice at the Wall
Beginners utilize structural support by placing heels against a vertical wall with legs positioned at a 45-degree angle. Traditional arm placement extends overhead along the floor, sometimes weighted with a sandbag, while alternative modifications place palms flat beside the hips. Bending the knees into the chest precedes the exhalation phase where the legs straighten, challenging the core musculature while maintaining neutral spinal alignment.
References
- Yoga Journal Archives. (1995). Urdhva Prasarita Padasana. Yoga Journal, March–April issue.
- Berman, Morris. (1989). Coming to Our Senses: Body and Spirit in the Hidden History of the West. Fawcett Columbine.
- Todd, Mabel Elsworth. (1937). The Thinking Body: A Study of the Balancing Forces of Dynamic Man. Paul B. Hoeber, Inc.
