I'm a runner, and I have always had breathing issues running and biking up huge hills, I can do it no problem but my breathing is super hard, once I get up it I feel drained...but in a few minutes I'm right back to normal. I dont know why this is because I dont have asthma or anything and I love the challenge of hills but I dont know why I tend to breathe so hard going up them...I'd really like to know as well