Becki,<div>I can completely relate to absolutely everything. Don't panic! I'm 50 now, and although I'm not currently running, I've done a lot in the past. First, listen to your body and don't let yourself get to the point where you are so winded, you need to stop. Stop before that, and walk until you can jog again. Don't worry about speed in the beginning...that will come.</div><div>There is a principal in exercise physiology called the SAID principle..."specific adaptation to imposed demand." Basically that means that you get really good at what you do. So even though you may be incredibly fit doing other types of exercise, it takes awhile for your body to adapt to jogging...but it will</div><div>I coach a lot of people with CF, and the main thing is to make sure you are enjoying what you do...if you dread it, you are pushing too hard. That doesn't mean don't push yourself, but do it in small increments. It sounds like you are doing the C25K program? That's for people with normal lung function, so adapt it to you...repeat weeks as you need to...slowly progress...and enjoy yourself.</div><div>Cheers!</div><div>Julie</div>