According to the great sage Patanjali, a definitive point of yoga is soul identification and awakening of the subconscious mind which comes through self-acknowledgment and self-sanitization.
“Introduction to Elements of Yoga
Yoga has its underlying foundations around 5000 years BC as portrayed in Indian Vedic Philosophy and Tantras.
Patanjali, an extraordinary sage made this way into a Darshan (Philosophy) in his Book “Patanjali Yoga Sutra”. In which he has defined Yoga as an Eight Limbs or Eight-Fold way.
In Sanskrit “Ashta + Anga” is Ashtanga. “Ashta” signifies Eight and “Anga” is the body part so it implies Eight Limbs.”