The half moon yoga pose (Ardha Chandrasana) is a challenging standing balancing pose. It's an intermediate pose, so make sure you're familiar with the fundamentals of yoga and can perform Triangle Pose before attempting Half Moon. You would go from Triangle to Half Moon to Downward Facing Dog in a flow sequence.
How to do
Stand straight and open the legs more than shoulder’s width
Support the back at the waist with all the fingers together
Drop the head backwards stretching the neck muscles
Makes spine flexible and strengthens the spinal nerves
Strengthens the neck muscles, and improves breathing capacity
Helps in cervical spondylitis
Avoid in case of vertigo or a tendency to giddiness
Hypertensive patients shall bend with care
Note: All the asanas and pranayama should be performed under the guidance of your certified yoga teacher.