At first, each step on the treadmill brings a lightness built of purpose...hey, I'm getting my steps in! But as each foot pounds out a repetitive rhythm...thud, thud; thud, thud, my thoughts wander darkly as I trouble over the concerns of myself, and even more strongly, the concerns of my children. The dark curtain starts to fall around me as I plod on. I worry so about this same curtain falling around my beloved children. Parenting is hard.