Krishnamacharya, who was the father of most of the yoga poses we know in our modern practices, said that yoga is the practice of seeking out the obstacles to our freedom and working to dissolve them. A yogi, he said, is someone invested in knowing their self better, someone investigating their self. Certainly this does not describe a practice that is for the uncommitted or for those who want only to experience sugar and spice and everything nice. That is not what a yogi is made of.