I am in a slump. I feel tired and slow and unmotivated. And ever since October 14 -- when I ran in the 5K Making Strides Against Breast Cancer event -- I can't seem to find the inspiration to exercise. I am making myself do it -- here and there -- but my usual drive and push and spunk are missing. Typically, I crave exercise and feel lethargic if I don't accomplish some sort of daily physical challenge. But for the past week or so, I have no craving, no desire to walk or run or lift weights, no appetite for my usual fitness routine. I am just plain tired.

Fatigue is a common side effect of cancer treatment -- even years after treatment ends, according to some experts. So perhaps my drop in energy and enthusiasm is due to the cumulative effect of my own treatment for breast cancer that just ended in June. My treatment spanned almost two years. Maybe it's no surprise my body is lagging behind my expectations for physical health.

Experts also say exercise helps combat fatigue. I believe this -- it's why I usually like exercise. It boosts my adrenaline, perks me up, makes me feel alive. If only I could get back into the swing of things, these feelings might come flooding back. But right now, I am not even thinking about how to find my old groove. I am just too tired.