Self-discipline gives everyone freedom. Discipline gives everyone freedom. Among them, "self-discipline" and "freedom" are two opposite sides. Generally speaking, self-discipline means obeying order, and freedom means jumping out of order and doing whatever you want. This kind of opposition can deepen people's impression of Keep and convey to consumers that long-term self-discipline according to the requirements of the Keep course can liberate themselves, and there is no need to suppress their ideas for weight loss and other issues. Copywriting can also use the method of setting opposites when creating sales copy to form conflicts, which can deepen consumers' impression and enhance their reading interest, thus improving the reading rate of sales copy.