On the label
- The Physical Activity Guidelines list goal setting, monitoring progress, social support and self-reward as strategies that help people stay active.
- Step counters combined with goal setting have been shown to increase physical activity, according to the guidelines.
- The CDC suggests picking activities you enjoy and that match your abilities so you stick with them.
The hardest part of a new habit is remembering to do it. A reminder on your phone works for a few days, then becomes background noise. Habit stacking takes a different route: instead of finding new time, you attach the new action to a routine that already happens without fail. Brushing your teeth, waiting for the kettle, sitting down at your desk. The old habit becomes the reminder.
The formula
Every stack has the same shape: after or while I do the thing I already do, I will do the new small thing. The new thing has to be small enough that you cannot talk yourself out of it. Two minutes is a good ceiling at the start. The aim is to make the action automatic first and bigger later.
- While the kettle boils, I will do ten slow squats.
- After I pour my morning coffee, I will fill my water bottle.
- When I finish a video call, I will stand up and walk to the window and back.
- After I park the car, I will take the stairs instead of the lift.
- When I set my phone on the charger at night, I will set tomorrow’s alarm for the same time as today.
Why tiny actions are worth stacking
It is fair to ask whether ten squats or a walk to the window does anything at all. The federal answer is yes. The second edition of the Physical Activity Guidelines for Americans dropped the old rule that activity had to last at least 10 minutes to count, concluding that bouts of any length contribute to the health benefits of your total activity. The guidelines also say that for people who are not yet active, a good first step is to replace sitting with light-intensity activity. Stacks are a way of collecting those small pieces without planning a workout.
Building your first stack
Step 1: list your anchors
Write down five things you do every single day at roughly the same time. Waking up, the first coffee, lunch, getting home, brushing your teeth. These are your anchors. An anchor that only happens on some days, like the gym, is a poor choice because the new habit will skip whenever the anchor does.
Step 2: match the action to the moment
Some pairings are natural. Movement fits waiting time: kettles, microwaves, loading screens. Water fits food and drink moments. Sleep habits fit the end of the evening. A mismatch, such as push-ups right after a heavy lunch, is a stack you will quietly abandon.
Step 3: keep it small for two weeks
The Physical Activity Guidelines advise people who are inactive to start low and go slow, increasing how often and how long they are active gradually. The guidelines also note that the risk of injury to bones, muscles and joints is tied to the gap between your usual activity and a new level. Small stacks keep that gap small.
Track it, lightly
Tracking does not have to be an app. The CDC offers a printer-friendly Physical Activity Diary for tracking weekly activity, and a tick on a paper calendar works just as well. The Physical Activity Guidelines report that step counters and other wearable monitors, combined with behavioral strategies such as goal setting, increase physical activity by giving people feedback. The point is to see the streak, not to count every step.
| Strategy from the guidelines | Low-effort version |
|---|---|
| Set goals | One stack, written on a sticky note |
| Monitor progress | A tick on the calendar each day |
| Social support | Tell one person what you are trying |
| Self-reward and positive self-talk | Notice the streak instead of the misses |
| Problem-solving to prevent relapse | Decide now what you will do on a bad day |
The left column comes straight from Chapter 8 of the Physical Activity Guidelines, which describes how professional and peer-led programs help people set goals, monitor progress, seek social support and use self-reward and positive self-talk, along with structured problem-solving to avoid slipping back to an inactive routine. You can borrow the same tools without joining a program.
Bring someone in
The guidelines say adults are more likely to take part in physical activity when they are supported by others, and name buddy systems and walking groups as ways to provide that support. A stack can be shared: a walk after dinner with a partner, or a standing break that a colleague takes at the same time. If the other person is counting on you, the habit has a second anchor.
Pick things you actually like
The CDC’s advice on sticking with activity is simple: pick physical activities that you enjoy and that match your abilities. A stack built on something you dread will last as long as your patience. If squats bore you, try dancing to one song while dinner cooks. If stairs hurt your knees, a slow walk on the flat is fine. More ideas for movement that does not feel like a workout are in The 10-Minute Home Workout: No Equipment, No Excuses.
Tip: Plan the bad-day version in advance. If the stack is ten squats, the bad-day version is three. Doing the small version keeps the anchor and the habit linked, which matters more than the number.
Stacks that work together
Once one stack runs on its own, chain the next to it. Wake up at the same time, open the curtains, drink a glass of water, and stand for your first email. Each step is the cue for the next. The morning part of that chain is covered in Morning Light and Energy: Working With Your Body Clock, and the bigger list of habits worth stacking is in Low-Effort Habits for More Energy: Small Changes That Add Up.
If you have a health condition, the CDC recommends talking with your doctor about the types and amounts of activity that are right for you before adding more.