Yoga is sam'skrta word derived from root verb Yunj+ ghain(suffix) forms the word Yog means  unification. Unification of human "I" with the Cosmic "I" is called Yoga. It was invented in India 500 Years ago but in the passage of timeYogis used to reformed with new dynamism. 

The whole system of Yoga is built on three main structures:Yoga exercise"A'sanas", breathing"Pra'n'a'ya'ma, and meditation "Sa'dhana'". The exercises of Yoga are designed to put pressure on the glandular systems of the body, thereby increasing its efficiency and total health. The body is looked upon as the primary instrument that enables us to work and evolve in the world, and so a Yoga student treats it with great care and respect. Breathing techniques are based on the concept that breath is the source of life in the body. The Yoga student gently increases breath control to improve the health and function of both body and mind. These two systems of exercise and breathing then prepare the body and mind for meditation, and the student finds an easy approach to a quiet mind that allows silence and healing from everyday stress. Regular daily practice of all three parts of this structure of Yoga produce a clear, bright mind and a strong, capable body.

No, Yoga is not simply stretching and postures. Yoga is complete science of life. It starts from principles of moral code to physical health through practicing different postures and finaly establishes in higher stance spirituality.

Yoga is not a religion rather Yoga is an ancient science of life. It is a need of everybody  in daily life. 

Yoga has eight parts called As't'aunga Yoga (eight folds of Ra'jayoga propounded by Mahars'i Patanjali) are:

1. Yama - Code of conduct in dealing with  others or external world.
2. Niyama - Code of conduct for self purification.
   
3. A'sana - Postures for physical health and mental composure.
4. Pran'a'ya'ma -control of vital force (Pra'n'a va'yu)'
5. Pratya'ha'ra -" Withdrawal" - withdrawing the unsteady mind from the allurement of particular objects.
6. Dha'ran'a' -  Concentration ( it can be learnt from Aca'rya)
7. Dhya'na - Deep concentration on Is't'a
8. Samadhi - complete merging in supreme concsiousness " unification" final destination of Yoga.

A'sanas are the yoga postures which enable to give inetrnal effects in targeted organs, glands in order to balnce hormonal secretion, to cure diseases and to bring the flexibility in whole body parts.

We name ásanas as follows:

1.  Some ásanas are similar to animal movements so they are named after those animals; for example, matsyamudrá [fish posture], garud́ásana [bird posture], etc.
2.  Some ásanas have the characteristics of animal structures, so they are also named after those animals; for example, kúrmakásana [tortoise posture], etc.
3.  Some ásanas are named by the qualities of the ásana; for example, sarváuṋgásana [shoulder stand; literally “all-limbs posture”]. The entire body is benefited by this ásana.

We believe it is our duty to point out that it is extremely dangerous for pregnant women to do any inverted poses because of the possibility of complication in pregnancy. In fact, we strongly discourage pregnant women from performing most Yoga poses during pregnancy. We do recommend that pregnant women learn and practice simple daily breathing and meditation techniques, which can help result in an easier delivery and a healthy baby and mother.

Yes, sure you can start to practice Yoga from any moment, we understand,care and respect students feelings and teaching we accordingly. It is very important that Yoga should be learnt from well experienced teacher.