Breather Fit is an evidence-based, drug-free Respiratory Muscle Training (RMT) device designed to help professional athletes, triathletes, and Olympians gain a competitive edge. RMT is scientifically proven to extend your time to fatigue, improve your cardio performance, increase your V02 max levels, reduce exercise-limiting dyspnea, and extend your lactate threshold. Respiratory Muscle Training is also used to strengthen diaphragmatic muscles, delivering greater vocal and instrument range for entertainers.