The Adiyogi
The ādiyogi, the enlightened, went into a state of thandavam/ the cosmic dance. The cosmic dance led to a meditative state called Samadhi. Seven sages who were witnessing this wanted to learn the supreme science of yoga, they started offering unlimited Sādhanā to the ādiguru, and then the ādiguru decided to teach yoga/ the supreme science. From then the light of yoga started enlightening the human race.