What did the original yoga texts primarily utilize as their language?

The original yoga texts primarily utilized Sanskrit as their language due to its historical and cultural significance in ancient India. Sanskrit is one of the oldest languages in the world and served as the primary language for many philosophical, religious, and literary works in Indian civilization. The foundational texts of yoga, such as the Vedas and the Upanishads, as well as later texts like the Yoga Sutras of Patanjali, were written in Sanskrit. This language allowed for the precise expression of complex spiritual and philosophical concepts, which are essential to the practice and understanding of yoga. Its grammatical structure and rich vocabulary provide a depth that is often difficult to achieve in other languages, making it particularly suited for the profound teachings found in yoga literature.