Why yoga?

 
Yoga is a physical, mental, and spiritual practice or discipline which originated in India. There is a broad variety of schools, practices and goals in Hinduism, Buddhism.
The origins of Yoga have been speculated to date back to pre-Vedic Indian traditions, but most likely developed around the sixth and fifth centuries BCE, in ancient India’s ascetic circles, which are also credited with the early sramana movements.

The chronology of earliest texts describing yoga-practices is unclear, varyingly credited to Hindu Upanishads and Buddhist Pāli Canon, probably of third century BCE or later. The Yoga Sutras of Patanjali date from the first half of the 1st millennium CE, but only gained prominence in the 20th century.

Schools of yoga

Hatha yoga texts emerged around 11th century CE, and in its origins was related to Tantrism.
Many studies have tried to determine the effectiveness of yoga as a complementary intervention for cancer, schizophrenia, asthma, and heart disease. The results of these studies have been mixed and inconclusive, with cancer studies suggesting none to unclear effectiveness, and others suggesting yoga may reduce risk factors and aid in a patient’s psychological healing process.
Yoga came to the attention of an educated western public in the mid-19th century along with other topics of Indian philosophy. In the context of this budding interest, N. C. Paul published his Treatise on Yoga Philosophy in 1851. According to Jacobsen, “Yoga has five principal meanings:

• Yoga as a disciplined method for attaining a goal
• Yoga as techniques of controlling the body and the mind
• Yoga as a name of one of the schools or systems of philosophy (darśana)
•  Yoga in connection with other words, such as “hatha-, mantra-, and laya-,” referring to traditions specialising in particular techniques of yoga
• Yoga as the goal of Yoga practice