The kundlini is actually a mental body.
Centuries of spiritual practice by yogic sages came to the
conclusion that there are seven chakra points, from the groin to
the top of the head.
These are also mental points, that if concentrated on, will help
develop certain aspects of a person's character.
Like the base chakra at the groin, influenced by colour red,
helps develop courage and confidence. The second chakra at the end
of the spine, influenced by the colour orange, helps one to be at
peace and in harmony with oneself. These are just two examples.
It applies universally, not only to people of Indian origin.
Whether it is true or it works or not, so far no one have proved
the sages and gurus wrong. Many are satisfied it works. There are
the skeptics.
There are other ways to fire enthusiasm into your life.
Awakening the kundalini is one of them. And there are plenty of
other self-improvement books that promises to do the same.