壞習慣為什麼容易養成？其實是因為壞習慣往往會提供立即的好處。例如，吃甜點會得到立即的快樂，但如果連續一兩年一直吃很多零食，可能體重會增加。相反的，好習慣沒有立即好處，卻要長時間的養成才會得到好處。Meanwhile, good habits are often the exact opposite. The immediate reward of going to the gym or going to the gym for like a week isn't really that great, your body's probably sore, and you don't have much to show for it, your body looks the same, your weight hasn't really changed.