In yoga, chakras are generally considered to be seven in total, but based on experience, there appear to be several different types of them.

Seven chakras as a preliminary stage of ascension. This is more about the activation of Ida and Pingala, causing the central axis of the body to become heated, rather than true Kundalini awakening. At this stage, it seems that what is primarily felt is a sensation of heat. This can be considered a preliminary state related to the seven chakras.

On the other hand, what I think are the original chakra-like energy routes are located in front of and behind each major chakra. There may be some places where this is not the case, but generally speaking, I think it's mostly like that.

For example, the Anahata chakra (heart chakra) is said to be open in both the front and back. However, it may or may not be open. When it is closed, when opening it, there can be a shock wave-like phenomenon, such as "pon," although some texts state that "when opening chakras, experiential events may occur sometimes, but not always," so it doesn't necessarily happen every time. However, in my case, I often experienced this kind of sensation when the chakra opened.

The anterior part was quite open, while the posterior part had been a problem until now.

Regarding the ajna (third eye), it was previously open, but now the front is open, while the back seems to be either open or not fully open, resulting in a somewhat incomplete state.

Even in that situation, this time I felt a sensation of something opening up on the back side of my Anahata (heart chakra).

Thereby, I feel that the energy increasing and rising through the throat chakra (Vishuddha) in the neck has increased, and the amount of energy entering between the eyebrows and Ajna has also increased.

With this, furthermore, the brain becomes activated. This is not always a good thing, because as the brain activates, stiffness in the head can become tightness and discomfort, leading to headaches or pain in various parts of the head. In such cases, there's nothing we can do but forcefully expand and relax each area through meditation. As a result, the feeling of constriction gradually disappears, bringing relief.

Now, I think that what people in the world say about things being "easy" or having "distracting thoughts" becomes less relevant at this stage.

... If I say that, it may be a very misleading statement.

This feeling of tightness in the head is caused by stiffness around the periphery of the head. Therefore, I think the only measure to take is to forcefully loosen the area around the head. Personally, when it comes to things like this, whether it's painful or uncomfortable, or even if distracting thoughts arise at that moment, none of that matters. It doesn't matter at all.

...However, if you accept things like "just relax" or "eliminate distracting thoughts," as often said in the meditation and spiritual industries, then what is actually a very simple matter – that your "scalp is stiff" – gets replaced with complex spiritual concepts. This can sometimes lead to being invited to cults or strange, expensive spiritual seminars.

More than anything else, it's simply a story about relaxing your mind.

As a preliminary step, understanding and practicing things like eliminating distractions might be meaningful. However, these days, I feel that such things are not very relevant anymore.