Ardha Matsyendrasana:-
This Spinal Twist Yoga Pose, which takes its Sanskrit name from the great Yogic Sage Matsyendra, is one of the few Yoga Poses in the Basic Session that rotates the spine.
Most bend the Spinal Column either backward or forward, but to become truly flexible it must be twisted laterally as well. The movement also tones the spinal nerves and
ligaments, and improves digestion.

Physical Benefits
Increases flexibility in each vertebrae of the spine, from the base of the spine through the neck
Stretches the back muscles and hips
Massages the abdominal organs, helping to relieve constipation
Breathing becomes more rapid, speeding up circulation and creating an aerobic effect
Brings more blood flow to the spine

Energetic (Pranic) Benefits
Helps rouse the Kundalini Shakti

Mental Benefits
Brings peace of mind
Helps to cure nervous disorders
Technique
The half spinal twist begins from the child's pose resting position following the bow pose.