Prepare for bad days, weekends, travel and missed days, then decide what the next month looks like.
- DAY 22
Write your hard-day rule
Write one sentence that defines a hard day for you and what you will do on it, for example "If I am sick or out late, I do the small version after your chosen moment."
Hard day: Write the first half of the rule and finish it tomorrow.
Deciding in advance what counts removes the in-the-moment debate about whether a shortened session is worth doing.
- DAY 23
Plan your weekend version
Write when your cue happens on a typical Saturday and Sunday, and if it moves, write the weekend cue you will use instead.
Hard day: Write your Saturday cue only.
Weekend schedules often shift the usual cue, so naming a weekend version keeps the if–then plan valid all week.
- DAY 24
Pack a travel version
Decide what your action looks like away from home, write it on your card, and put anything it needs in the bag you usually travel with.
Hard day: Write the travel version in one line.
Travel removes your familiar setting, so a portable version prepared in advance keeps the action available in a new context.
- DAY 25
Script your restart
Write the exact sentence you will use after a missed day, such as "Next time my cue happens, I do the small version," and keep it with your card.
Hard day: Say the restart sentence out loud once.
In a well-known habit study, missing one opportunity did not materially change the overall habit formation process, so returning at the next cue is what matters.
- DAY 26
Test the cue alone
Turn off any reminder for today and see whether your cue by itself prompts you to start your action, then note the result in your check-in.
Hard day: Leave the reminder on but note whether you started before it went off.
Checking whether the moment itself prompts the action tells you how much the routine still depends on external reminders.
- DAY 27
Explain your routine
Write three lines as if explaining your routine to a friend: your anchor, your action with its length, and your hard-day version.
Hard day: Write only your anchor and action in one line.
Recalling the plan from memory rather than rereading it strengthens your hold on it and reveals any part that is still unclear.
- DAY 28 · REVIEW
Week four review
Read your check-ins from days 22 to 27, including the cue test on day 26. Change one thing that would make the routine sturdier for the next month.
Hard day: Read the day 26 check-in and write one change.
A final review focused on sturdiness prepares the routine for ordinary life after the plan's daily prompts end.
- DAY 29
Choose your next month
Decide one direction for the next 30 days: keep the same size, grow it a little, or keep it steady and start a separate small action. Write your choice on your card.
Hard day: Circle one of the three options on your card.
Choosing a single direction avoids piling several changes onto a routine that is still settling.
- DAY 30
Set your next check
After your chosen moment, do your action for 5 minutes, rate how automatic it felt from 1 to 5, and set a calendar note two weeks from now to rate it again.
Hard day: Do the small version and set the two-week calendar note.
The time it takes for a behavior to feel automatic varies widely between people and actions, so a later check shows progress that 30 days cannot promise.