This mudra called GARUDA MUDRA or Eagle gesture.This particular mudra will enhance our metabolism and immune system and also sharpen our concentration ability.This also helps to reduce our lethargic and tiredness gradually.Giving a good strength for our gums and teeth's.For best result should practice in empty stomach or before food 10-15 minutes by sustain in the gesture.A suggestion, one may practice a deep breathing while doing this.There is also a precise mantra for this mudra but only can revealed in person if its necessary..all the best and soon with another mudra..