By improving breathing efficiency, some studies suggest that these mouthpieces can help reduce your respiratory rate (breathing rate) during exercise. A lower respiratory rate can help delay the onset of lactic acid buildup, which is a key contributor to muscle fatigue.

Unlike bulky equipment such as a CPAP machine, a breathing mouthpiece is small and fits into a compact, protective carrying case. This makes it easy to slip into a gym bag, backpack, or carry-on luggage without taking up much space.