and, who should be certifying a Yogi, who can possibly do so? Did Krishna, Buddha or Patanjali have some certification? Forget the Oldies and the Divines, even Shivananda, or, more recent Iyengar had no certification. Why this kolaveri of Yoga and Yogis now?
Yoga ia a way of life. One who does not live Yoga can never ever share the Yogi Way of Life. Certificates issued by them are worthless. The real Yogis are Acharyas, they teach by their own life example.
100, 200, or 500 hours training cannot turn you into a Yogi. It is a lifetime sadhana. Wake up and be a True Yogi!