I suffered shoulder injures when I did wrong butterfly strokes myself three years ago. I was in pain and lost until I have watched a SNT clips on YouTube in 2019. Since then I have almost watched every SNT clip; from how to swim butterfly to all types of core exercises. The good things are: I lost weight, I cured my shoulder pains and I have managed to extend my butterfly strokes from mere 15metres to close of 100. Now I am learning backstroke technic and hope one day I can start my IM. Thank you SNT.