I am 15, and I'll admit, not in the best shape. I joined a gym and got a personal trainer session free. He did a heart rate test as part of the fitness examination. When he showed me his chart afterwards, he explained that my heart rate was slightly over 200, that was about 30 more than the worst "very poor" section (the lowest his chart went). Should I be concerned about this? I received warnings from the elliptical saying my heart rate was too high as well. Can this be CF related? Also, I sweat a lot when I exercise, even when it's not very strenuous. So if anyone could give me some advice or information that would be great.