Tree pose or Vrikshasana (Sanskrit: वृक्षासन, romanized: vṛkṣāsana) is a balancing asana. It is one of the very few standing poses in medieval hatha yoga, and remains popular in modern yoga as exercise.The pose has been called iconic of modern yoga; it is often featured in yoga magazines, and practised in public displays such as for the International Day of Yoga.

How to do Vrikshasana? 

• Stand straight.
• Balance firmly on your left leg and lift your right leg. Bend your right leg at the knee.
• Now, place your right foot against the inside of your left thigh. Make sure the toes of your right foot facing downward.
• Join your palms in prayer at your chest level. Now, lift your arms over your head till your hands are stretched upward.
• Hold the position while breathing deeply. 
• Lower your arms to chest level and then separate your palms. 
• Straighten your right leg and stand erect again. 
• Repeat the posture with your right leg.