Kundalini Yoga actually belongs to Tantrik Sadhana, which gives a detailed description about this serpent-power and the Chakras.
Excerpt from the book Kundalini Yoga by Sri Swami Sivananda

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Tantra:

Yoga of weaving the spiritual into the physical.

(See also: Tantra, Kundalini, Kundalini Yoga, Kundalini Dictionary)

Kundalini:

Kundalini- latent energy located at the base of the spine. Kundalini is like coiled sleeping serpent. The yogi works to gently awaken this dormant energy to attain enlightenment.

(See also: Kundalini, Tantra, Tantra Dictionary, Body Mind and Soul)

The floating exercise is an important part of the meditation practices of kundalini Tantra, and as such is normally one of the first exercises taught to a new student. Mastery of the floating exercise can bring alignment to virtually any technique or physical world method wished. The floating exercise can also open the student to alignment to any spiritual world method or benefit imagined.  

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Tantra: Why sexuality?

In the act of lovemaking the couple embodies the dyadic wholeness of the Supreme. TANTRIC sexual union resonates with the very foundational energies of the Universe: it captures, magnifies and re-directs the essential Cosmic Power of Life. It is therefore not by chance that sexual intercourse brings the most intense emotional experience that the human being can have while in the flesh. Therefore TANTRA uses it predominantly to create that overwhelming unifying energy. The erotic impulse stirs up the KUNDALINI energy so that it can rise, through the subtle duct of power along the spine, to the highest center of power above the head. This process renders the adept immortal:

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The different yoga schools simply adhere to different applications of inner discipline, all of which ultimately lead to the liberation of the soul and to a unique understanding of the Divine Unity. The schools are merely named according to the yogi's objective of self-transformation and the instrument chosen for such anticipated change. The yoga schools are: Ashtanga Yoga, Purna Yoga, Integral Yoga, Bhakti Yoga, Karma Yoga, Raja Yoga, Ashtanga Yoga, Kundalini Yoga, Hatha Yoga, Mantra Yoga,and Tantra Yoga.

Read more here: » Yoga Schools: The different Schools of Yoga

The mysterious Tradition of Tantra

This article attempts to outline, in an extremely general way, some basic ideas of the Tantric tradition. Even though the author has a rich personal experience in some of the practical aspects of TANTRISM, the intention here is not to expose a personal view, but to present the Tradition in its most pure form, without any kind of "western interpretations" that most of the time kill and destroy the authentic meaning. This is done with the sincere intention to revive, mostly from the practical point of view, this lost Tradition and to reveal the true face of TANTRA Science.

Read more here: » Tantra Yoga: The Left Hand Path of Love - Tantra

Tantra: Sanctified Sexuality

The TANTRIC philosophy itself includes in its theory all the levels of the Universe and gives a paramount importance to astronomy, biology, parapsychology, anatomy, meditation, medicine, music, art and even sexuality. In fact, the sexual experience, considered to be a unification of the Everlasting Male (+) and Everlasting Female (-) principles, has a very important place in TANTRIC techniques and procedures which are often profoundly erotic.

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Tantra: Returning to origins

TANTRA YOGA considers that the human being has an extremely complex body and mind. The usual consciousness of wakefulness is considered to be only a very small fraction of our native intelligence, fruit of a very long period of evolution and development of the human being. The practitioner tries to follow the same road of evolution but in an opposite direction. He must go through all stages in inverted order and leave them behind, until he finds the starting point or the unique origin. This is logical if we realize that TANTRA considers the human being to be a summary of the Universe and therefore all the cosmic elements have their correspondent in the visible and invisible man.

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Tantra: The Libido - thirst for Unity

Another aspect which is important in TANTRA YOGA is that the libido, when manifested as sexual drive, is not at all considered to be only sensuality but, at the innermost levels, as the soul's ardent yearning for spiritual perfection. Here the erotic impulse appears as the psyche's abyssal thirst to reach perfection through unity of complementary polar opposites. In this way, re-born as a genuine Androgyne of the Secret Tradition -- magical child of SHIVA and SHAKTI -- the Individual Spirit will have access to the highest levels of Consciousness.

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Tantra: Experimental duplication

TANTRA Science relies upon the practical realization of its teachings. Here we are not dealing with endless talking and argumentation but instead with engaging ourselves fully and thoroughly in an exceptional practice which can lead the practitioner to Freedom, Pure Existence, Super-Consciousness, Beatitude and super-normal powers (SIDDHIS).

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Tantra: Orgasm and ejaculation

Stated with extreme simplicity, orgasm is an intensely beatific state of consciousness and canceling of ego, with profound harmonizing, relaxing and regenerative effects. Male and female ejaculation is only a complex physiologic process of explosively energetic discharge with a dim manifestation of a brief, incipient orgasm, experienced in a selfish unilateral way. During ejaculation, the energy is quickly wasted and for no purpose (except when conception is wanted).

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Sacred Sexuality: The Principles and Practices of Tantric Yoga

We are in a season of accelerated personal and global awakening, a season that calls us to be clear about our values, our priorities, our soul purpose for this incarnation, and fundamentally, to be clear about our self-identity. But as metaphysics and mysticism go mainstream, great discernment is called for lest we bring along our old separate, fear-based self-identities that manifest the illusion of all lack and limitation.

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Celibacy: Sex Is Not Compulsory

Most of the sex advice books written during 1960s underlined the idea that the world could be saved by sex - without, of course, enduring the messy and inconvenient complications of an unwanted pregnancy. Many therapists of that era encouraged their neurotic and mentally disturbed patients to 'find themselves' and become better balanced individuals through positive experiences of sex. Sometimes, surrogate partners would be provided for the purpose. We liked to believe then that much mental illness as well, resulted from long-held repressions, and that these could be released through sex.

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Tantric Celibacy: Going All the Way With Tantric Celibacy

Tantric yoga, as a system of rituals, exercises, and philosophical teachings, was developed over the past 2,500 years in a practical search for profound feeling and awareness. Just as a modern scientist might spend years on a single research problem, tantric yogis might dwell on a certain feeling for hours a day, plumbing its every nuance and what it told them about existence. They became experts in the arts of feeling and concentration.

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The different yoga philosophies simply adhere to different applications of inner discipline, all of which ultimately lead to the liberation of the soul and to a unique understanding of the Divine Unity. The yoga philosophies are merely named according to the yogi's objective of self-transformation and the instrument chosen for such anticipated change.

Read more here: » Yoga Philosophy: The different Yoga philosophies

The different yoga schools simply adhere to different applications of inner discipline, all of which ultimately lead to the liberation of the soul and to a unique understanding of the Divine Unity.
The schools are merely named according to the yogi's objective of self-transformation and the instrument chosen for such anticipated change.

Read more here: » Yoga: Schools of Yoga

The word ' Yog ’ is derived from the verb yuj which means to yoke, to join, to connect. The end of life is to yoke oneself to the holy spirit i.e., the Paramchaitanya. Hindu scriptures enlighten us on the various ways or margas of doing so. The union with the holy spirit is possible through Gyan Yog, Karma Yog, Bhakti Marg, Mantra Yog, Raj Yog, Sanyas Marg or Hath Yog.

The rishi-munis have particularly adopted the Gyan Yog which is possible only through Dhyan . For the householder, Karma Yog and Bhakti Marg are the most practical ways of attaining moksha. Ascetics have developed the knowledge of mantra-tantra . Hath Yogis have evolved various Aasanas, postures and occult practices for awakening the Kundalini. Shri Aadishakti Shri Mataji Nirmaladevi has advocated the Sahaj Yog for householders to attain the Parmachaitanya through the raising of the Kundalini.

(See also: Sahaj Yog, God and Religion, Peace on Earth, Peace of Mind, Love and Happiness, Life and Beyond, Body Mind and Soul)

Yoga is a family of ancient spiritual practices that originated in India, where it remains a vibrant living tradition and is seen as a means to enlightenment. Karma Yoga, Bhakti Yoga, Jnana Yoga, and Raja Yoga are considered the four main yogas, but there are many other types. In the West, yoga has become associated with the asanas (postures) of Hatha Yoga, which are popular as fitness exercises. Yoga as a means to enlightenment is central to Hinduism, Buddhism, Sikhism, and Jainism, and has influenced other religious and spiritual pr ...

Including:

• Yoga - Yoga practice and intention
• Yoga - The word yoga
• Yoga - Diversity of yoga
• Yoga - Yoga and religion
• Yoga - Common themes
• Yoga - Origins
• Yoga - Hindu yoga
• Yoga - Bhagavad Gita
• Yoga - Patanjali
• Yoga - God in Yoga philosophy
• Yoga - Hatha yoga
• Yoga - Natya yoga
• Yoga - Buddhist yoga
• Yoga - Yoga and tantra
• Yoga - Notable Yogis

Read more here: » Yoga: Encyclopedia - Yoga

Modern yoga practice often includes traditional elements inherited from Hinduism, such as moral and ethical principles, postures designed to keep the body fit, spiritual philosophy, instruction by a guru, chanting of mantras (sacred syllables), quietening the breath, and stilling the mind through meditation. These elements are sometimes adapted to meet the needs of non-Hindu practitioners. Proponents of yoga see daily practice as beneficial in itself, leading to improved health, emotional well-being, mental clarity, and joy in living. ...

See also:

Yoga, Yoga - Yoga practice and intention, Yoga - The word yoga, Yoga - Diversity of yoga, Yoga - Yoga and religion, Yoga - Common themes, Yoga - Origins, Yoga - Hindu yoga, Yoga - Bhagavad Gita, Yoga - Patanjali, Yoga - God in Yoga philosophy, Yoga - Hatha yoga, Yoga - Natya yoga, Yoga - Buddhist yoga, Yoga - Yoga and tantra, Yoga - Notable Yogis

Read more here: » Yoga: Encyclopedia II - Yoga - Yoga practice and intention