In the yogic lore, each of the Saptarishis, the legendary seven sages, imbibed and mastered 16 ways from Adiyogi after years of transmission.
After 84 long years of heartbreaking sadhana, the Saptarishis have begun to imbibe yoga from Adiyogi. Many more years pass, until the day Adiyogi tells them that the time has come for them to go out and offer yoga to the world.