Most personal goals die of vagueness. We write down things like "get in shape", "read more classics", or "write consistently". They sound noble on New Year's Eve, but they leave us empty-handed on an ordinary Tuesday evening. When a goal has no shape, your brain treats it as an open question: What should I do? How much is enough? When am I finished? Facing all those choices after a long day is exhausting, so we end up scrolling through our phones instead. The cure is not more willpower. The cure is turning a loose wish into an eight-week experiment. Why...