This strategy works by deputizing others to enforce your habit for you.

Pros:

• No formal rules or mechanisms are required, just the social pressure from the outside.
• If you find yourself constantly breaking your own commitments, this may be the only tool you can use to effectively control your behavior.

Cons:

• Most people won’t care about your behavior as much as you should.
• Doesn’t work if others aren’t watching you while you perform the habit.

The goal is to do it every day (if possible) but if you miss a day, you must do the habit the following day.

Pros:

• Easier to keep up for longer stretches with harder habits.
• Easier to handle on an irregular schedule.

Cons:

• You’ll be much more likely to take days off unnecessarily if you know it’s only two-in-a-row that count.
• If you sometimes do X, and sometimes don’t, it will take longer to make the association automatic. 

Keep track of how many days in a row you’ve successfully followed your habit. As your chain gets longer and longer, you become increasingly committed to the habit.

Pros:

• Maintains habits over a longer timeframe than a 30-day trial.
• Better for things you already do (or are easy to do).
• The longer your chain, the more serious your commitment. 

Cons:

• Accidental slip-ups or situations where your habit becomes impossible can collapse your motivation.
• Many habits don’t work on an easy daily or weekly interval.

2 main ways you can condition a habit:

• Classical conditioning: a paired association with a trigger and a behavior. Going to the gym after you wake up each morning is this kind of habit.
• Operant conditioning: you not only associate a trigger with a behavior, but you reward that pairing, to accelerate the habit-forming process.

It means practicing the habit a bunch of times in an artificial situation so that it occurs more automatically in real life.

Pros:

• For when you think you won’t be able to consciously control your reaction in the real situation without practice.
• When the behavior you want to perform requires skill or knowledge you might not possess without practice.

Cons:

• The practice may not fully transfer to the real situation.
• Practicing multiple times in the same session is known to have a weaker impact on long-term changes to your behavior.

You commit to some change for 30 days, then tou can go back to your old ways. But having spent thirty days applying a new behavior is often enough to convince you to stick with it.

Pros:

• Can handle more significant/difficult behavior changes you might be unlikely to start with a perpetual commitment.
• Fosters an experimental mindset, rather than assuming you already know what’s best.

Cons:

• 30 days probably isn’t enough to actually make something a habit.
• Without a long-term plan, many 30-day trials will revert back to the original behavior.

The basic process for building all habits is basically the same: you repeatedly condition the behavior you want, over time, until it becomes automatic.

But no habit starts out automatic; there’s a deliberate period, where you must consciously apply yourself to make a certain behavior your default.