Nyās is the focussing of energy flow through the medium of the fingers joined together at the tips. By doing nyas, we focus our spiritual energy by directing our bunched fingers towards a particular energy centre.
1. Nyas to a Kundalini chakra (spiritual energy centre):
For example, if the remedy was to do nyas on the mid-brow chakra (Ādnyā-chakra) it would look like this.
2. Nyas to two Kundalini chakras:
If the remedy was to do nyas on the mid-brow chakra and the heart chakra (Anāhat-chakra) it would look like this.
Mechanism behind the action of nyas
Nyas should always be accompanied by chanting. By chanting we imbibe divine energy of the aspect of God Whose Name we chant. By doing nyas, we channelise the divine energy derived from the chanting to that particular spiritual energy centre. By doing so, that energy is dispersed to the organs in that area.
If your hand starts aching during the course of doing nyas you can bring your hand down and rest it for some time or you can change your hand.