On a morning in March, for what might have been the fifth time in two years, I snoozed until 5:15. In bed, I agonized over whether I would keep the promise I had made to myself the night before: that this morning, I would skip my scheduled sixty minutes of power yoga. I would not skimp on my usual breakfast of one-half of a cup of oats, one-third of a scoop of protein powder, one handful of blueberries, and one tablespoon of pumpkin seeds.