Martial Arts UltraBreathe Lungs Exerciser

Athletes who want to boost their performance and folks who suffer from breathlessness can all benefit from using this ingenious breathing exerciser. Hereâ??s how it works: after positioning the soft mouthpiece between the teeth and gums and biting down to create an airtight seal, the user breathes in sharply and continues to breathe in hard for as long as possible. Then the breath is slowly ex...