I Am 56. I Just Had A Normal EKG 2

I am 56. I just had a normal EKG 2 months ago. I go to spin class 4 to 5 days a week with very good results and great recovery time. Just went to high altitude to go skiing and did great. Over the last few weeks have begun to feel an occasional, very slight chest discomfort at sort of a point but it moves around a little bit. Otherwise feel great.