Emerging research suggests that nasal breathing might be more effective and better than mouth breathing during exercise.
IN OCTOBER OF 2019, James Newbury got into a mountain bike accident. just earlier that same year he had finished fifth in the 2019 CrossFit games. The 29-year-old Australian suffered two broken bones in his back, three broken ribs and a punctured lung. Yet, just a few months later, Newbury not only recovered, he completed an Ironman competition.
Link to full article: https://health.usnews.com/health-news/blogs/eat-run/articles/nasal-breathing-the-secret-to-optimal-fitness