Alright I've been there too. I Kept having chest pains while taking short hikes to fisihing spots. Sometimes they were so bad I had to sit down on a log and wait for them to go away or at least be less painful. I kept telling myself I was just getting old at 50 and had to much weight. I got smart and went in for an exam. Yep, high blood pressure and a clogged artery. I have no idea why it didn't kill me out there while sitting on a log with no one else around. I am on meds now and excercise 5 to 6 times a week. I have no more chest pains. Yes it can happen to you so if you are having shortness of breath and or chest pains witih moderate activity GO SEE YOUR DOCTOR!