NP psyche_hector! Here are some references (and good links) regarding yoga! Best know about what you enjoy, don't you think? Good wishes.
Yoga
The ancient Yogis recognised long ago that in order to accomplish
the highest stage of yoga, which is the realisation of the self, or God consciousness, a healthy physical body is essential. For when we are sick, our attention is seldom free enough to contemplate the larger reality, or to muster the energy for practice.
The masters of yoga also teach us that personal growth is possible only when we fully accept our embodiment and when we truly understand that the body is not merely skin and bones but a finely balanced system of energies.
http://www.experiencefestival.com/yoga
Yoga (Sanskrit: योग Yoga, IPA: [joːgə]) is a group of ancient spiritual practices originating in India. As a general term in Hinduism[1] it has been defined as referring to "technologies or disciplines of asceticism and meditation which are thought to lead to spiritual experience and profound understanding or insight into the nature of existence."
[2] Yoga is also intimately connected to the religious beliefs and practices of the other Indian religions.
Outside India, Yoga is mostly associated with the practice of asanas (postures) of Hatha Yoga or as a form of exercise, although
it has influenced the entire Indian religions family and other spiritual practices throughout the world.[3]
Hindu texts discussing different aspects of yoga include the Upanishads, the Bhagavad Gita, the Yoga Sutras of Patanjali, the Hatha Yoga Pradipika, the Shiva Samhita, and many others.[3][4]
Major branches of Yoga include: Hatha Yoga, Karma Yoga, Jnana Yoga, Bhakti Yoga, and Raja Yoga. [5] [6] [7] Raja Yoga, known simply as Yoga in the context of Hindu philosophy, is one of the six orthodox (āstika) schools of thought, established by the Yoga Sutras of Patanjali.
http://en.wikipedia.org/wiki/Yoga
For a better discussion of the history of Yoga, we could divide it into four periods: the Vedic Period, Pre-Classical Period, Classical Period, and Post-Classical Period.
Vedic Period
The existence of the Vedas marks this period.
The Vedas is the sacred scripture of Brahmanism that is the basis of modern-day Hinduism. It is a collection of hymns which praise a divine power. The Vedas contains the oldest known Yogic teachings and as such, teachings found in the Vedas are called Vedic Yoga. This is characterized by rituals and ceremonies that strive to surpass the limitations of the mind.
http://www.abc-of-yoga.com/beginners...ogahistory.asp (This is a good site for information for you.)