When I do cardio, my heart rate shoots up to about 160-170. Everyone else's is 110-120, and they tell me mine is too high and I should tell my doctor. Does anyone know if this is dangerous? I had an EKG at my last physical and it was fine, so my resting heart rate must be normal. I feel fine when I exercise. I can breathe, talk, and feel OK. When I first started in january, I felt awful, I felt like I was gasping for breath and like I was gonna die, but I was really out of shape back then. Its not the machine either, I have tried several different machines, several different types of machines, and other people have tried the same ones I try with normal results.