Habit stacking is attaching a new fitness habit to one you already do without thinking, written as a single sentence: after I [existing habit], I will [new habit]. It works because the old habit does the remembering, which is the job willpower is worst at. Mr PT Fitness is a private home studio at 35 McIntosh Road, Dee Why, run by Matt Reilly, a personal trainer with 10+ years' experience. The clients here who train for years rarely have more self-control than the ones who stop after two months. They have a stack. The kettle goes on, so the squats happen.
What is habit stacking?
Habit stacking is using a habit you already have as the trigger for one you want. You do not schedule the new habit by clock time. You schedule it by what comes immediately before it. The sentence is the whole method: after I put the kettle on, I will do 10 squats.
Most fitness advice fails at the reminder, not the effort. Nobody skips 10 squats because 10 squats are hard. They skip them because at 6:40am there is nothing in the kitchen that says now. An anchor habit fixes that for free, because you already do it, in the same place, every day, without a decision.
The other advantage is size. A stack is deliberately small enough that a bad day does not beat it. On the week a client is sick, travelling, or working late every night, the gym session goes and the two-minute stack survives, which is how the whole habit survives with it.
How does the "after I X, I will Y" formula work?
You name a specific existing habit, the exact moment it ends, and the one new action that follows. Vague versions fail. "I'll stretch more" has no trigger, no place and no size, so nothing in your day ever fires it.
Compare the two. "I want to walk more" leaves you deciding, every single afternoon, whether now is the moment. "After I close the laptop at the end of the day, I will walk to the end of the street and back" decides it once, and the laptop closing does the rest. Same intention, completely different failure rate.
Three things make an anchor a good one. It happens daily, not occasionally. It happens in the place the new habit needs to happen. And it has a clear ending, so there is an obvious gap for the new habit to sit in. Brushing your teeth qualifies. "When I have some free time" does not.
What are 10 fitness habit stacks that work?
These are the ten that come up most often with clients, and all of them take under 10 minutes. Pick one. Not three.
| After this | Do this | Takes |
|---|---|---|
| I put the kettle on | 10 bodyweight squats while it boils | 40 seconds |
| I brush my teeth at night | Pack the training bag, put it by the door | 2 minutes |
| I sit down to breakfast | Put a protein food on the plate first | 30 seconds |
| I park the car at work | Take the stairs, not the lift | 1 minute |
| I finish my last work call | Change into training clothes | 2 minutes |
| I close the laptop | Walk to the end of the street and back | 10 minutes |
| I finish a session | Log the weights in my phone before I leave | 60 seconds |
| I leave work on a Tuesday | Drive to the studio, not home first | No extra time |
| I fill my water bottle | Drink a full glass before the first coffee | 20 seconds |
| I get into bed | Set the alarm, put the phone across the room | 30 seconds |
The eighth one is worth singling out. Driving home first and intending to head back out is where most evening sessions die, and clients coming from Collaroy, Curl Curl and Brookvale who go straight to Dee Why attend far more often than the ones who stop at home. The stack is not about effort. It is about never passing the couch.
Want help picking the right stack?
Free 15-minute consult at the Dee Why studio. We pick your anchor, your one habit, and the two training days it feeds. Book here or call 0422 745 334.
Why does stacking beat willpower?
Because willpower has to be spent every day, and a stack is spent once. You make the decision on a Sunday afternoon when you are calm, and it then runs on a Wednesday night when you are not. That is the same reason consistency beats intensity across a training year.
Willpower is also unreliable in exactly the conditions you need it most. It is lowest when you are tired, hungry, stressed or at the end of a long day, which describes most of the moments when a session is on the line. A trigger you did not have to remember is not affected by any of that.
There is a second effect worth knowing. Stacks make progress visible on days you did not train, and that matters for whether you still see yourself as someone who trains. A fortnight where work took over is very different if the gear was still packed nine nights out of ten.
How do I build a stack that holds?
Write one sentence, keep the habit under two minutes for the first fortnight, and do not add a second stack until the first one runs on its own. Most people fail here by stacking a whole morning routine at once and losing all of it in the first bad week.
- One stack, written down. Put the sentence somewhere you will see it near the anchor, on the fridge or the bathroom mirror.
- Shrink it until it is almost too easy. Ten squats, not a workout. You can grow it later, and you almost certainly will.
- Attach it to the end of the anchor, not "sometime after". The gap is where stacks get lost.
- Expect 8 to 10 weeks. Habit research points at roughly two months on average, with a wide spread between people, so judge it on months rather than days.
- Missing once is normal. Apply the never miss twice rule and pick it up the next day rather than restarting the count.
Once a stack is automatic, the useful move is to grow it rather than replace it. Ten squats becomes ten squats and a set of push-ups. The evening walk gets an extra street. Nothing new has to be remembered, because the trigger is already doing its job.
General information, not individual medical or dietary advice. See your GP or an Accredited Practising Dietitian for your situation, and a physiotherapist if a movement causes pain. If you would rather have the structure built with you than guess at it, that is most of what a trainer does, and the studio and how it runs is set up around fixed, repeatable times for the same reason.
Frequently asked questions
What is a habit stack?
A habit stack is one new habit attached to a habit you already do automatically, written as a single sentence: after I put the kettle on, I will do 10 squats. The old habit acts as the reminder, so you are not relying on memory or motivation to start the new one.
How many habits can I stack at once?
One. Adding two or three at the same time is the most common reason stacks collapse, because a bad week takes all of them down together. Run a single stack until it happens without you thinking about it, usually around 8 to 10 weeks, then add the next one.
What is a good first habit to stack?
Packing your training gear straight after you brush your teeth at night. It takes about two minutes, it is almost impossible to fail, and it removes the biggest morning excuse before the morning arrives. Start there rather than with the training session itself.
Start with one habit, not ten
Free 15-minute consult. We pick the anchor, the habit, and the training days that stick to them.