Looks like we came into Wim Hof in the same way at about the same time! I'd experimented briefly with the breathing technique beforehand, but early lockdown I saw a discount for one of his courses and committed. It was a life-changing pursuit, even while I haven't continued with the cold exposure as much as I'd like to have. It's a hard routine to keep up in the winter especially I find. But the breathing has been a part of my every day for nearly 5 years now. Great piece, David. Always nice to meet another fan of Wim Hof.