I am 38 active good shape. Recently I have been running in five finger shoes (about two months) no more than 3 miles...about a month ago, I strained my calf muscle left leg...I continued to train. Today I went to a chiro appointment, askeed about my calf, this led to an x-ray, the x-ray showed two stress fractures..okay no big deal, but before I left the Radiologist noted that I had an artery showing calcification...BP was 130/88 HB at 60 (rest) last year all my cholestrol (good and bad were straight) I am a Marine that stays fit..what might be going on?