Sirsasana - Headstand
Inversions reverse the action of gravity on the body. This can be said to of the effect of inversions on the emotional and energetic levels. Inversions turn everything upside down, allowing us to experience a different perspective.

Sirsasana or Headstand:

• Encourages a greater blood flow to the brain, nourishing cells and the endocrine glands (pituitary – the major regulatory gland and the pineal – which regulates our circadian rhythms).  This helps create greater clarity and awareness, and helps rectify any hormonal imbalances
• Can help relieve anxiety and other psychological disorders
• Assists the flow of venous blood and lymphatic drainage from the lower limbs
• Enhances circulation
• Strengthens core muscles and upper body
• Alleviates strain on the spine by inverting the usual pressure of gravity
• Can improve structural alignment
• Improves balance
• The weight of the abdominal organs on the diaphragm also encourages deeper exhalation – which aids clearing of the lungs, is beneficial for conditions like asthma, and can (I find) bring about a sense of greater relaxation.