I do exercise on a regular basis, but cannot do it daily because of the tremendous fatigue that accompanies exercise, @FarrisTimimi. Might this indicate that my heart meds need to be changed or is this typical? I also met with my endocrinologist recently who said that my magnesium level was at the low normal range (1.8) and that it was possible that when I exercise I go below the normal range and that causes muscle fatigue. I suppose that would affect the heart muscle as well? I have no edema.