This governs the gap between what you have decided to do and what you actually do on an ordinary Tuesday. Clear's claim is that the gap is a design problem, not a character problem: behavior follows a loop of cue, craving, response and reward, and every one of those four stages can be engineered from outside. Nothing below asks you to want it more, because in this book wanting it more is not the mechanism.

Do

Turn the intention into a sentence with a time and a place in it. A 2001 UK study split 248 people into a control group, a group given motivational material about exercise, and a group that additionally wrote down exactly when, where and for how long they would work out. The first two groups exercised at 35 to 38 percent weekly. The third hit 91 percent, on the same motivational input. [Source: "Chapter 5: The Best Way to Start a New Habit"]

Anchor the new behavior to one you already perform reliably. Clear's own push-up habit died when the cue was "when I take a break for lunch" and stuck when it became "when I close my laptop for lunch, I will do ten push-ups next to my desk." Pick a cue that is specific, immediately actionable, and happens at the same frequency you want the new habit to happen. [Source: "Chapter 5: The Best Way to Start a New Habit"]

Change the room before you change your mind. A six month Massachusetts General Hospital study added water beside the soda in cafeteria refrigerators with no messaging at all: soda sales fell 11.4 percent and bottled water rose 25.8 percent. Amsterdam homes with the electricity meter in the hallway used 30 percent less power than near identical homes with it in the basement. Visibility alone moved both. [Source: "Chapter 6: Motivation Is Overrated; Environment Often Matters More"]

Give one space one use. Working from the couch and the kitchen table left Clear unable to separate work from rest until he got a dedicated room, and an insomnia study had subjects leave the bed entirely whenever they could not sleep so the bed itself carried only one association. If you have one room, split it into zones by activity rather than letting the same chair mean five things. [Source: "Chapter 6: Motivation Is Overrated; Environment Often Matters More"]

Scale the entry point to under two minutes and let it stay there for a while. Twyla Tharp says the ritual is not the two hours of training, it is hailing the cab: once she tells the driver where to go, the ritual is complete. A reader who eventually lost over 100 pounds started by going to the gym daily and forbidding himself from staying longer than five minutes. [Source: "Chapter 13: How to Stop Procrastinating by Using the Two-Minute Rule"]

Pick the identity first and treat each repetition as a vote for it. One person declines a cigarette with "I'm trying to quit," another with "I'm not a smoker," and the second has already moved. No single instance decides the election and no single lapse loses it, you only need a majority of votes. Work backward from the outcome to the kind of person who would produce it. [Source: "Chapter 2: How Your Habits Shape Your Identity (and Vice Versa)"]

Track the one habit you care about most, and after a miss make the next repetition the only priority. Rookie stockbroker Trent Dyrsmid moved one paper clip between two jars per sales call, 120 a day, and was bringing in $5 million within eighteen months. Clear's recovery rule is never miss twice: one miss is an accident, two in a row is the start of a different habit. [Source: "Chapter 16: How to Stick with Good Habits Every Day"]

Add physical steps to whatever you want less of. Clear unplugs the television and removes the remote's batteries so restarting it costs ten seconds, and leaves his phone in another room each morning, which buys him three to four uninterrupted hours. During the year he wrote the book his assistant reset his social media passwords every Monday and returned them on Friday, and he found he adapted almost immediately. [Source: "Chapter 12: The Law of Least Effort"]

Bind the thing you need to do to the thing you already want. Dublin engineering student Ronan Byrne wired his stationary bike so Netflix would only play while he pedaled fast enough. Dopamine rises on the anticipation of a reward rather than on receiving it, which is what temptation bundling actually pulls on. [Source: "Chapter 8: How to Make a Habit Irresistible"]

Get into a group where the behavior you want is already the ordinary thing to do. We imitate the close, the many and the powerful, and a 32 year study of 12,000 people found the odds of becoming obese rose 57 percent when a friend did. Clear's specific advice is to join a culture where the behavior is normal and where you already share something with the group, which is why Nerd Fitness works on people who feel out of place in a gym. [Source: "Chapter 9: The Role of Family and Friends in Shaping Your Habits"]

Don't

Don't build the plan around self-control. In 1971 over 15 percent of US soldiers in Vietnam were using heroin, and only about 5 percent relapsed within a year of coming home, against a roughly 90 percent relapse rate for stateside rehab patients who return to the same neighborhood and friends. The soldiers' entire cue environment vanished. Clear's summary is that people with the best self-control are the ones who need to use it least. [Source: "Chapter 7: The Secret to Self-Control"]

Don't use shame, on yourself or anyone else. Weight loss presentations that shame people raise stress and drive overeating, and blackened lung photographs raise anxiety in smokers and drive smoking. Cocaine users shown a photo for 33 milliseconds, too fast to consciously register, still had the reward pathway fire. The cue does its work whether or not you feel bad about it. [Source: "Chapter 7: The Secret to Self-Control"]

Don't set the goal and leave the system alone. Winners and losers share the same goals, so the goal cannot be what separates them, and many runners stop training the day after the race they trained for. Clear's line is that you do not rise to the level of your goals, you fall to the level of your systems. [Source: "Chapter 1: The Surprising Power of Atomic Habits"]

Don't let preparation stand in for the repetition. A University of Florida photography class graded one half purely on volume of photos and the other half on a single near perfect print, and every best image came from the quantity group while the quality group theorized. Outlining twenty article ideas is motion, writing one is action, and motion is attractive precisely because it postpones judgment. [Source: "Chapter 11: Walk Slowly, but Never Backward"]

Don't count days, and don't quit in the flat part. Automaticity comes from number of repetitions rather than elapsed time, so the 21 day and 30 day claims are the wrong unit entirely. A room warming from 25 to 31 degrees leaves the ice cube visibly unchanged and the 32nd degree melts it, and the work done at 25 through 31 was stored rather than wasted. [Source: "Chapter 11: Walk Slowly, but Never Backward"]

Don't pick a reward that argues against the identity you are building. Ice cream after a workout is genuinely tempting and casts a vote against being a healthy person. The reward has to be immediately satisfying, because the brain evolved for immediate consequences and heavily discounts delayed ones, but it also has to point the same way as the habit. [Source: "Chapter 15: The Cardinal Rule of Behavior Change"]

Don't let the number you are tracking become the thing you are optimizing. Goodhart's Law: when a measure becomes a target it stops being a good measure. Clear's example is a restaurant watching only daily revenue, which can be propped up with discounts and marketing while the food quietly gets worse. Track one habit, automate the measurement where you can, and remember what the number was standing in for. [Source: "Chapter 16: How to Stick with Good Habits Every Day"]

Don't assume the habit will keep improving you once it goes automatic. Automaticity dulls sensitivity to feedback and performance drifts slightly downward without deliberate refinement. Pat Riley's answer after the 1985 to 1986 Lakers were eliminated was a program tracking each player's own statistical baseline and asking for a 1 percent improvement, and they won the next two championships. Clear's own version is an annual review and a mid-year integrity report. [Source: "Chapter 20: The Downside of Creating Good Habits"]

Don't adopt someone else's habit if it fights your temperament. Habits that align with natural predispositions take far less willpower to sustain, so the low carb plan that works for a friend is not automatically your plan. Clear's diagnostic questions are what feels like fun to you but work to others, where you lose track of time, and where you get better returns than average. [Source: "Chapter 18: The Truth About Talent (When Genes Matter and When They Don't)"]

Don't treat a stalled habit as evidence about you. Clear's closing position is explicit: if you are having trouble changing your habits, the problem is the system rather than the person. When one stalls, rotate back through the four laws and find which of obvious, attractive, easy or satisfying has broken. [Source: "Conclusion: The Secret to Results That Last"]

The one line

Stop trying to win the argument with yourself and change the conditions the argument happens in, because the behavior follows the room, the cue and the friction rather than the resolve.