Yoga bases its origin in the premedical times in the Indian Mythology and subsequently in the Indian civilization. It can be summarized as a set of instructions formulated and improvised over ages to give it today's form. Yoga has now found its place even in the English dictionary which means that it has followers across the globe and has attained global heights. True blue followers include the who's who in Hollywood like Julia Roberts to President Obama. In India, a lot of holy men are preaching it to give it a national flavour as well. In India, organisations like the Patanjali, ViralHost and Government initiatives of Ayush (a movement to support Yoga/Ayurveda) have helped it to reach common man as well.
Yoga entails various traditional disciplines that are aimed at the harmonious development of body, mind and the soul. It is a methodical way of attaining perfection through various meditative practices and the continuous control of various elements of human nature (both physical and psychological). Inner perfection is gradually attained through continuous transformational yogic practices. With yoga one can improve vigour, vitality, various health conditions as well as increase longevity.
When we state the above, the scientifically proven methods of the postures (also known as Assanas in Yoga, India) allow physical condition to improve with improved blood circulation and muscular strength. There are different kinds of Asanas - generic as well as specific. The generic Asanas will cover the holistic view, where as the specific ones can be used for curing and improving various anamolies relating to blood circulation to a specific part in the body.
From its early days, Yoga India has been strongly associated with Ayurveda as the two combined to give a home grown wellness centre for the body and the mind. Ayurveda is also finding its righteous place in the world as more and more people are looking for alternatives to modern day medicine which is laced with side effects and harmful toxins. On the other hand the duo can give a perspective life of well being. In fact many preachers would like to sell them together as they both complement each other well in terms of therapies and diagnosis.
Yogic Asanas have a close relation with meditation as it is described as a state of mind where you can be free from diversions and obstructions. In fact some of the yogic postures are so difficult that once you master them, the whole mind is focused on diverting your attention on them and the endurance it takes. A combination of practise of yoga, meditation and Ayurveda is supposed to pave way for a life of abstinence and that has perhaps become the lifestyle of Indian sages who practise the three together in the Himalayas.