Review on Maximize Your Stamina and Performance with POWERBREATHER Sport by Antoine Collins

Used this product regularly in Summer 2019. I went swimming for 30 minutes. Somehow I lost my breath. It shortens my breath for days afterwards. The worst happened during my triathlon. Swim for 21 minutes and have been breathing very shallow ever since. It took several hours after the finish line badly. After that, I felt shortened breathing for a few weeks. A month later I tried the whistle again with the same results. I haven't used it for 2 months and my breathing is normal. But I don't want to use it anymore. I have completed 4 triathlons. This is a cool device idea if it wouldn't bother my breathing.