I thought life was a sprint, and I ended up losing.
For years I ran the way you run a sprint. First as a consultant, then building my own company: day and night, with no habit other than working. And it worked. I sold it.
When that ended I felt new. A world in front of me and nothing I had to do. What I didn't see coming was what happens when you cross the line and find out that wasn't the race.
A sprint is run on intensity and then it's over. A life isn't. Monotony doesn't arrive all at once: it arrives on a day you decide you'll do it tomorrow, and the next day you decide tomorrow again. From the outside it looked like I had everything under control. Inside I was losing the only thing that mattered: I stopped trusting my own word.
That's the part that's hardest to explain. It wasn't that I failed. It was that I no longer believed myself when I said I was going to do something.
What I was missing wasn't effort — I had more than enough of that. It was pace. You can hold intensity for six months; going far takes something else, something that still works on the days you don't want to. That is what habits are, and I didn't have a single one.
That's why I started Nura. I wanted something that would write down the truth, my defeats included, because the mind won't do it on its own: it tells you nothing's wrong, it's one more day, and that's how a whole year goes.
And before building anything, I sat down to read.
What I found
The first thing took apart what I had assumed. Habits don't make dreams come true: they build the ground so that you can. They make it more likely that you practise, that you learn, and that you sustain the actions that do move you closer. The outcome still depends on how good those actions are, on what you learn along the way, and on things you don't control.
The second thing was that it wasn't just me. I ended up with thirty references — meta-analyses, systematic reviews, seminal work — and what separates the people who sustain something from the people who drop it is almost never how hard they push. All of Nura came out of that. So these are the six points that most changed how I look at it.
The six points
A habit is not a streak
It's a response that fires on its own at a familiar cue: the place, the time, the thing you just finished. Counting consecutive days measures something else, and it breaks in one piece the first day you miss. What the research measures is automaticity: it rises and falls on its own, and one stumble doesn't knock it down.
In Nura. There's no streak to protect. Every action is tied to a cue, and what gets watched is whether it starts costing you less.
Wood & Rünger, 2016, Annual Review of PsychologyThere is no universal timeline
The 21 days come from no study at all. The most recent review, across 2,601 people, finds medians of 59 to 66 days and individual ranges from 4 to 335. Lally's original work gave 18 to 254. That spread isn't noise: it depends on the person, on the behaviour, and on how often the opportunity comes round.
In Nura. No countdown anywhere. A one-week experiment, and a review that adjusts it using what actually happened.
Singh et al., 2024, HealthcareWanting isn't enough: you have to say when
What closes the gap between intending and doing are plans of the form "if X happens, then I do Y". Across 642 tests the effect is real and uneven: it works better when the plan is specific, when there's motivation of your own behind it, and when it has been rehearsed. An intention with no moment and no place stays an intention.
In Nura. Every action in your plan carries its cue: when, where, and after what.
Sheeran et al., 2024, European Review of Social PsychologyContext does more work than willpower
Repeating in a stable setting predicts more automaticity and more attainment than repeating on sheer push. And when the context changes — a move, a new job, a trip — habits fall away even though the intention is intact. It's what explains something that had worked for months disappearing in a week without you deciding anything.
In Nura. Before asking you for more discipline, Nura looks for a cue that holds: "after coffee" survives a change of schedule better than "at 8:30".
Stojanovic et al., 2022, Frontiers in PsychologyDiagnose before prescribing
When a behaviour doesn't happen, the cause sits in one of three places: you can't (capability), you get no chance to (opportunity), or you don't want it enough (motivation). Three different problems asking for three different answers. Telling someone with no gap in their calendar to show more discipline isn't weak advice: it's aimed at the wrong problem.
In Nura. Nura asks before it proposes. And when something fails, it asks why it failed instead of repeating the same plan louder.
Michie et al., 2011, Implementation ScienceStarting and coming back are different problems
What gets you going isn't what keeps you going, and sustaining isn't the same as recovering. In Lally's study a missed opportunity didn't meaningfully alter the process: what separated those who carried on from those who stopped wasn't never missing, it was coming back. The literature on maintenance treats it as a phase with rules of its own.
In Nura. A miss is data for adjusting the plan, not a debt to repay. And the Reset Day comes from here.
Kwasnicka et al., 2016, Health Psychology Review
The thirty references
Everything the section above stands on, in the same order as in the document. Each link goes to the DOI, which is the article's permanent address.
- 8meta-analyses
- 8systematic reviews
- 4theoretical frameworks
- 10primary studies
- Meta-analysis
Singh, B., Murphy, A., Maher, C., & Smith, A. E. (2024). Time to Form a Habit: A Systematic Review and Meta-Analysis of Health Behaviour Habit Formation and Its Determinants. Healthcare, 12(23), 2488.
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Lally, P., van Jaarsveld, C. H. M., Potts, H. W. W., & Wardle, J. (2010). How are habits formed: Modelling habit formation in the real world. European Journal of Social Psychology, 40, 998–1009.
Open (opens in a new tab) - Systematic review
Wood, W., & Rünger, D. (2016). Psychology of Habit. Annual Review of Psychology, 67, 289–314.
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Gardner, B., Lally, P., & Wardle, J. (2012). Making health habitual: the psychology of habit formation and general practice. British Journal of General Practice, 62, 664–666.
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Gardner, B., Abraham, C., Lally, P., & de Bruijn, G.-J. (2012). Towards parsimony in habit measurement: the SRBAI. International Journal of Behavioral Nutrition and Physical Activity, 9, 102.
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Stojanovic, M., Grund, A., & Fries, S. (2022). Context Stability in Habit Building Increases Automaticity and Goal Attainment. Frontiers in Psychology, 13, 883795.
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Gardner, B., Rebar, A. L., & Lally, P. (2022). How does habit form? Guidelines for tracking real-world habit formation. Cogent Psychology, 9, 2041277.
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Ma, H., Wang, A., Pei, R., & Piao, M. (2023). Effects of habit formation interventions on physical activity habit strength: meta-analysis and meta-regression. International Journal of Behavioral Nutrition and Physical Activity, 20.
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Zhu, Y., et al. (2024). Digital Behavior Change Intervention Designs for Habit Formation: Systematic Review. Journal of Medical Internet Research, 26, e54375.
Open (opens in a new tab) - Meta-analysis
Sheeran, P., Listrom, O., & Gollwitzer, P. M. (2024). The when and how of planning: meta-analysis of implementation intentions in 642 tests. European Review of Social Psychology.
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Gollwitzer, P. M., & Sheeran, P. (2006). Implementation intentions and goal achievement: a meta-analysis of effects and processes. Advances in Experimental Social Psychology, 38, 69–119.
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Wang, G., Wang, Y., & Gai, X. (2021). A Meta-Analysis of Mental Contrasting With Implementation Intentions on Goal Attainment. Frontiers in Psychology, 12, 565202.
Open (opens in a new tab) - Theoretical framework
Michie, S., van Stralen, M. M., & West, R. (2011). The behaviour change wheel: a new method for characterising and designing behaviour change interventions. Implementation Science, 6, 42.
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Michie, S., et al. (2013). The Behavior Change Technique Taxonomy (v1) of 93 hierarchically clustered techniques. Annals of Behavioral Medicine, 46, 81–95.
Open (opens in a new tab) - Meta-analysis
Harkin, B., et al. (2016). Does monitoring goal progress promote goal attainment?. Psychological Bulletin, 142, 198–229.
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Ntoumanis, N., et al. (2021). A meta-analysis of self-determination theory-informed intervention studies in the health domain. Health Psychology Review, 15, 214–244.
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Teixeira, P. J., et al. (2012). Exercise, physical activity, and self-determination theory: a systematic review. International Journal of Behavioral Nutrition and Physical Activity, 9, 78.
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Rothman, A. J. (2000). Toward a theory-based analysis of behavioral maintenance. Health Psychology, 19, 64–69.
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Kwasnicka, D., Dombrowski, S. U., White, M., & Sniehotta, F. (2016). Theoretical explanations for maintenance of behaviour change: a systematic review. Health Psychology Review, 10, 277–296.
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Schwarzer, R., Lippke, S., & Luszczynska, A. (2011). Mechanisms of health behavior change in persons with chronic illness or disability: HAPA. Rehabilitation Psychology, 56, 161–170.
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Sniehotta, F. F., Schwarzer, R., Scholz, U., & Schüz, B. (2005). Action planning and coping planning for long-term lifestyle change. European Journal of Social Psychology, 35, 565–576.
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Verplanken, B., & Sui, J. (2019). Habit and Identity: Behavioral, Cognitive, Affective, and Motivational Facets of an Integrated Self. Frontiers in Psychology, 10, 1504.
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Wood, W., Tam, L., & Witt, M. G. (2005). Changing circumstances, disrupting habits. Journal of Personality and Social Psychology, 88, 918–933.
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Verplanken, B., & Roy, D. (2016). Empowering interventions to promote sustainable lifestyles: testing the habit discontinuity hypothesis. Journal of Environmental Psychology, 45, 127–134.
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Milkman, K. L., Minson, J. A., & Volpp, K. G. (2014). Holding the Hunger Games Hostage at the Gym: An Evaluation of Temptation Bundling. Management Science, 60, 283–299.
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Kirgios, E. L., et al. (2020). Teaching temptation bundling to boost exercise: a field experiment. Organizational Behavior and Human Decision Processes, 161, 20–35.
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Wrosch, C., et al. (2003). Adaptive self-regulation of unattainable goals: goal disengagement, goal reengagement, and subjective well-being. Personality and Social Psychology Bulletin, 29, 1494–1508.
Open (opens in a new tab) - Systematic review
Kwasnicka, D., & Naughton, F. (2020). N-of-1 methods: exploring trajectories and designing precision behaviour change interventions. Psychology of Sport and Exercise, 47, 101570.
Open (opens in a new tab) - Meta-analysis
Williamson, O., et al. (2024). The performance and psychological effects of goal setting in sport: a systematic review and meta-analysis. International Review of Sport and Exercise Psychology.
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Verplanken, B., & Orbell, S. (2003). Reflections on past behavior: a self-report index of habit strength. Journal of Applied Social Psychology, 33, 1313–1330.
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How this was put together
This is an applied synthesis, not a registered systematic review. Meta-analyses, reviews and primary sources were prioritised. It's also worth knowing that habit research concentrates on relatively simple health behaviours: carrying its conclusions over to studying, selling or training has to be checked case by case. Which is why Nura measures what happens to you, rather than assuming an average describes you.
From the evidence to the plan
Everything above lives inside the app: the cue on each action, the experiment that lasts a week, the review that adjusts the plan using what happened, and the day every thirty to look at the whole thing.