STUDIA SPORTIVA 2021/288 Michal Žák, Jan OndráčekMasaryk University, Faculty of Sports Studies, Brno, Czech Republic https://www.researchgate.net/publication/357090470_Breathing_as_one_of_the_components_of_biathlon_shooting_in_youth_biathletes/fulltext/61bb3d58fd2cbd7200a3f89c/Breathing-as-one-of-the-components-of-biathlon-shooting-in-youth-biathletes.pdf Paper which uses the Vernier Go Direct Respiration Belt: