The beginnings of Yoga were developed by the Indus-Sarasvati civilization in Northern India over 5,000 years ago. The word yoga was first mentioned in the oldest sacred texts, the Rig Veda. It is both spiritual and physical. Yoga uses breathing techniques, exercise and meditation. It helps to improve health and happiness. Yoga is the Sanskrit word for union. Patanjali was a pioneer of classical yoga. He defined yoga as "the cessation of the modification of the mind".His classification of classical yoga, as set out in his Yoga Sutras. He defined the eight limbs as yamas (abstinences), niyama (observances), asana (postures), pranayama (breathing), pratyahara (withdrawal), dharana (concentration), dhyana (meditation) and samadhi (absorption).

Yoga is also commonly understood as a therapy or exercise system for health and fitness. The practice of Yoga was widely promoted by powerful families, institutions, and activities until India attained its independence in 1947.Today, It is practiced worldwide by millions of people in many forms and variations.
Types of yogas
Classification based on mind and body.
Rajayoga: Raja yoga focuses on meditation and contemplation in order to fully realize the self.
Hathayoga: Hatha yoga is the practice of yoga postures, or asana, using the body as a vehicle for self-transformation.
Classification based on way of spiritual life.
Gyanyoga: It is a way of knowledge.
Karmayoga: It is a way of work.
Bhaktiyoga: It is a way of worship.
Classification based on a way of other things.
Swaryoga: Emphasizes the most on breathing.
Kriyayoga: Emphasizes the most on blending Karmayoga (Tapa), Gyanyoga (Swadhyay) and Bhaktiyoga (Ishwar Pranidhan).
Yoga is not a religion; it is a way of living that aims towards ‘a healthy mind in a healthy body’.Man is a physical, mental and spiritual being; yoga helps promote a balanced development of all the three. body becomes more flexible after consistent yoga practice and you also develop a great sense of self-discipline and self-awareness. In short, it improves our well-being and gives us better mental clarity. Yoga needs to be practiced in a very subtle, gentle way, not in a forceful muscle building way, because it is not about exercise.
A consistent yoga practice decreases blood pressure through better circulation and oxygenation of the body, decreases the respiratory rate through a combination of controlled breathing exercises and better fitness,Gastrointestinal functions have been shown to improve in both men and women who practice yoga and Pain tolerance is much higher among those who practice yoga regularly
There are many benefits that can actually be experienced from without the body. From better sleep to more energy and strength, this list provides several benefits found on the outside of the body.It increases metabolism, immunity, strength, energy, better sleep, prevents from aging.
There are many emotional benefits to be gained from a consistent yoga practice. It reduces stress, anxiety,depression and increases calmness, concentration, self control, and positive outlook on life. Doctors and nurses love yoga because studies indicate that it can help prevent heart problems, Asthma and so many diseases.