I’m not a very sedentary person. Sitting still is not my strong suit. If I’m sitting down I’m usually tapping my foot. In bed, I rock my feet back and forth before going to sleep. I’m normally not aware I’m doing it until one of my cats, usually Skye, pounces and bites through the bedspread, latching on to my toes.

But a couple months ago I found myself more fatigued than usual. I knew something was amiss while playing tennis when my energy level plummeted and I became winded playing doubles. Nobody gets winded in doubles. Plus I was short of breath just walking upstairs.