How to do the Vrksasana tree pose in yoga

The tree pose improves balance, concentration and posture.
( especially for people with leg and foot problems and for people who sit a lot during work )
The tree pose strengthens calf thigh and back muscles and slightly stretches the hip and groin area.

# Start from the mountain pose ( tadasana )
# Lift your left knee and put your left foot sole on the inside of your right thigh.
Exhale while you do this.
# Then raise your extended arms to horizontal level.
Both palm point down.
# Inhale again and close your palms in front of your chest at the same time ( praying position )
# Finally exhale and lift your closed palms over head.
Keep breathing concentrated through the belly and hold this position for a while.