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Message: <blockquote data-quote="Numen" data-source="post: 131811"><p>All my life, I've had more difficulty than most with stamina during any cardiovascular exercise. I reach exhaustion really quickly. I have no known health problems and I'm pretty strong. I grapple and go to mma classes but for some reason everyone else can outlast me. One thing I've noticed is that I sigh frequently, which leads me to think of an oxygen problem. Thanks ahead of time.</p></blockquote><p></p>