Intense breathe work

[Whitelight01]

Anyone have experience with The Wim Hoff Method, or Yogic(I think?) style breathing exercises? I practice the cold immersion part of WHM, but the breathing portion gave me panic attack symptoms, and I'm not sure it is the healthiest thing for a person, after much research.

Anyone incorporate this into AP or meditation? It seems like there could be something there(intuition), and I would love some feedback from someone who has used it successfully.