Mudras are powerful gestures that stimulate the flow of prana in your body and thus capable of immense transformation.
The Sanstrit word Vraja means thunderbolt and Pradama means unshakeable, hence this name was
given to this mudra- that builds an unshakeable confidence, inner strength and faith in yourself!!
Practice every day during your meditation for as many minutes as you feel comfortable, do not strain the fingers.