Bend ring finger and little finger and touch the tip of thumb with their tips keeping the remaining two fingers stretched.
As it is the mudra of life, it improves the power of life. Weak people become strong. It reduces the clamps in blood vessels. If you practice it regularly, you will become active.
No specific time duration. One can practice it any time.
It improves immunity.
It improves the power of eyes and reduces eye related diseases.
It balances the vitamin deficiency and helps reduce fatigue.