I'm a 16 year old female and weigh about 125. I'm about 5"4'. Track practice started today and we had to run about 2 miles nonstop. We also did a few other exercises like sprinting. I generally try to keep fit and stay healthy but i couldn't breathe at all after half a mile or so. My heart was beating super fast and my face turned red. My right calf muscle started to cramp and my ears were throbbing. about an hour after practice was over, my heart was still not at a resting heartbeat. My mom has heart problems and i'm wondering if it was possible she could've passed it down to me although my doctors have never said anything.