Step 2: Press the Tongue Up
Next, I want you to press the tongue to the roof of the mouth. Do this, so the back of the tongue is drawn back slightly, so you can feel it pressing into the throat slightly. At the same time, press the entire tongue upwards.
In the image, you will see that as I do this, the frenulum, the tissue that connects the tongue's underside to the lower jaw, is lengthed. This is effectively a technique called Jihva Bandha. However, it is better to modify this by keeping the mouth closed.