Actually, it's a different kind of a tongue. Like the one James talks about.'
James 3:6
6 And the tongue is a fire, a world of iniquity: so is the tongue among our members, that it defileth the whole body, and setteth on fire the course of nature; and it is set on fire of hell.
The Pentacost somebody else might explain better for you. but the Most High God's Holy Spirit is what we're going for, not Kundalini-induced stuff.
I will confess it: I used to actually enjoy Kundalini-focused yoga.
The "Kundalini" spirit is a SERPENT. It tells the believable lie. "Father of lies."
Before I came to know Christ Jesus, I had no knowledge as to the harm I had incurred through choosing to use Yoga and regular meditation as a form of exercise and spiritual work on myself.
Once I'd found Christ, the scales literally fell from my eyes, and I began to view what I'd once thought all right as being unclean, and even spiritually out of favor with God.
Kundalini energy is the SNAKE straight from the time of Eden.
Our Heavenly Father's Holy Spirit is always PURE, and is called the "sweet, heavenly dove" in some hymns in that the Holy spirit's wisdom, truth and patience stand guard through the night over us as needed.
No Kundalini SNAKE winding itself around my heart will I trust again.
This leads to self destruction of a very subtle and really deceptive kind.
Hope I've helped you a little to understand what's at stake here is your SOUL if you engage in such practices.
Nowadays, I stick with our Lord and Redeemer. And I am healthier in spiritual and psychological terms than I ever could have dreamed before finding Christ (well He found me, but that would be for another time)
God's Peace through Christ to you