Yoga is a union of body, mind, and spirit. The history of yoga is long and steeped in tradition. Yoga is an ancient system of health and fitness which originated in India. The word yoga has its first mention in the Rig Veda, the oldest of the sacred texts. Those that study Yoga estimate it's age to be four thousand year. The history of Yoga can be divided into four main periods which are the pre-classical period, classical period, post-classical period and modern period. In the history of yoga, the book is called the yoga sutras. The history of yoga would not have been completed in the classical stage of yoga. The word Yoga literally meant the Yolk that joins something together, such as an ox to a cart. The idea is that yoga unites all aspects of being into one. What most people envision to be Yoga, those contortionist postures, is really only one small aspect of a much larger field of practices. The methods of yoga includes ethical disciplines, physical postures, breathing control and as well as meditation. The 20th century witnessed a renaissance of yoga that caused a globalization of this ancient tradition. Modern approaches to yoga have created a clear delineation between the Hindu religion and the practice of yoga. Through the practice of yoga, an individual can gain information about physical, emotional, mental and spiritual well being. Over the long history of yoga, different schools have emerged, and there are numerous examples branches and philosophies that have spawned. Ultimately, all agree on one common element the fundamental purpose of yoga is to foster harmony in the body, mind, and environment. Today yoga is accepted as a comprehensive exercise to promote control of the body and mind. More than just a means of being fit and trim, yoga can help you live a healthy, whole, and empowered life. In recent decades, yoga has greatly and swiftly evolved. Yoga is the most diversified spiritual practice in the world. The living tradition of yoga now recognizes no borders as it continues to spread globally.