I've had poor circulation my entire life, although I exercise regularly and eat for good health. (I'm 43 yoa.) My legs and arms can fall asleep if there is any pressure on them. I am often cold, especially my fingers and toes, and people have noted that I have blue lips in cold weather. However every doctor has stated during my physical exams that I'm in perfect health, and that my blood pressure is normally 120/70, and a pulse of 45-55 bpm. Recently while jogging, my legs feel extremely heavy, and it becomes difficult to finish the runs at any speed. It feels like I have never exercised in my life. Can poor cirulation be causing the tightness while exercising?