17. Shashakasan :

 

 

Advantages :

• Enhances blood flow to the head and makes ankles and knees flexible.

Pre-caution :

• Patients with peptic ulcer should not perform this asan.

18. Bhujangasan :

 

 

Advantages :

• It tones up spine.
  
  
• It helps to increase the body heat and strengthens digestive power.
  
  
• Helpful for people suffering from back pain.
  
  
• Helps to control the food intake.
  
  
• Helpful for asthma patients.

Pre-caution :

• People having pain in the lower spine should avoid this asan.
  
  
• People having pain in wrist, hands and shoulders should avoid this asan.
  
  
• People with surgery of abdomen and elbow surgery shoul avoid this asan.

19. Baddhanaukasan :

 

 

Advantages :

• Makes middle of the spine flexible.
  
  
• It strengthens the hips, arms, thighs, knees, calves and feet.
  
  
• Strengthens the lungs.
  
  
• It strengthens the muscles of the back, abdomen, neck and shoulders.
  
  
• Useful for people suffering from diabetes.

Pre-caution :

• Those suffering from hypertension and heart disease should not practice it.

20. Ardhshalabhasan :

 

• This asan requires a sudden movement during its practice and hence it should be done very smoothly.