What Is Temptation Bundling? The Study Behind the Habit Trick

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· 7 min read

🕐 30-second summary

  • The term comes from a real field experiment at the gym: Milkman, Minson, and Volpp (2014), published in Management Science.
  • The restricted-access group added 0.48 visits/week; the group merely "encouraged" to self-impose the pairing added just 0.27 — roughly half.
  • By the end of the 9 weeks, 61% of participants chose to pay to keep the restriction in place.
  • The study covered one behavior (exercise) at one institution over 9 weeks — it doesn't prove long-term persistence or generalization to other habits.
  • Generate your own temptation-bundling combo in the tool below.

The pitch shows up constantly in productivity content: only let yourself watch your guilty-pleasure show while you're on the treadmill, only listen to your favorite podcast while doing chores, and suddenly the habit you avoid gets easier.

It sounds like a blog trick. It's actually the plain-language description of a real, published field experiment — and the study is more specific, and more useful, than the one-line version that circulates online.

The study that named it

The term comes from Katherine Milkman, Julia Minson, and Kevin Volpp's 2014 paper in Management Science, built around a field experiment at university gyms. Participants were people who owned an iPod and wanted to exercise more but weren't currently doing so.

🧠 Science: They were split into three groups. A control group got nothing new. An "encouragement" group was simply told about the idea of pairing a tempting audiobook with gym visits and encouraged to try it on their own. A "full treatment" group was given iPods preloaded with four addictive, page-turner audio novels — but access to those novels was technically restricted to the gym itself (Milkman, Minson & Volpp, 2014).

Control participants averaged 0.75 gym visits in the first week. The encouragement-only group added a marginal 0.27 visits — a small, only marginally significant bump. The full-restriction group added a regression-adjusted 0.48 visits, a meaningfully larger and statistically significant increase (p < 0.01). By the end of the nine-week study, 61% of participants chose to pay to keep their tempting audio novels restricted to the gym going forward.

Why restriction beat encouragement

The detail that gets lost in the one-line version of this idea is the gap between the two treatment groups. Simply telling people "hey, try bundling your want with your should" produced a small, barely-significant effect. Physically restricting the want to only be available during the should produced roughly double the effect and reached clear statistical significance.

💡 Tip: The mechanism isn't just "make chores more fun" — it's removing the option to get the reward without doing the work. That's closer to what researchers call a commitment device than a motivation hack: it works partly because it takes willpower out of the equation, not because it relies on more of it.

📲 Track the habit — and whether the restriction held. TrakBit lets you log your "should" habit and, separately, whether you kept your restriction intact this week — the data point the real study was actually testing. Download TrakBit free on the App Store →

What counts as a valid want/should pair

Based on how the study was designed, not every "do something fun while you do something hard" combination is really temptation bundling. Three conditions mattered in the original design:

  • The want has to be something you'd otherwise feel a little guilty enjoying — the audio novels used in the study were deliberately low-brow, addictive page-turners, not prestige fiction.
  • The should has to be something with a delayed, hard-to-feel-in-the-moment reward — exercise is the textbook example because the payoff is real but distant, while the effort is immediate.
  • The restriction has to be real, not just a rule you tell yourself — the strongest effect in the study came from participants who couldn't access the audio novels anywhere except the gym.

What the study doesn't establish

The experiment was conducted with university staff and gym members at a single institution, over nine weeks, and measured gym attendance specifically. It doesn't tell us whether the same size effect holds for habits outside exercise, over longer timeframes, or in populations very different from the study sample.

It also doesn't test whether the effect fades once the novelty of a new audiobook wears off — the study measured willingness to keep paying for the restriction at nine weeks, not habit persistence at six months or a year. Worth knowing before assuming the trick scales indefinitely to any habit you want to build.

How to track it without confusing the want and the should

If you're building a temptation bundle, the thing worth tracking as your actual habit data is the "should" behavior itself — did you do the workout, finish the task, complete the routine — not whether you enjoyed the pairing.

Add your combo to TrakBit in one click

Suggested template: "Log the 'should' habit, and each week check whether I kept my 'want' restriction intact." [Button: Add this template to TrakBit →] — deep link to a preloaded template with two separate lines: the main habit and a weekly restriction check, with no-punishment recovery.

Separately, it's worth noting whether you kept the restriction intact: did you let yourself access the "want" outside of the paired context this week? That second data point is the one most people stop tracking once the bundle starts feeling natural — which is exactly when it's most useful to check.

FAQ

What is temptation bundling in simple terms? It's pairing an instantly enjoyable but slightly guilt-inducing activity (a "want") with a habit that has a real but delayed benefit and that you tend to avoid (a "should") — with access to the want restricted to only when you're doing the should.

Is there real research behind temptation bundling, or is it just a productivity blog idea? It comes from a peer-reviewed field experiment: Milkman, Minson, and Volpp (2014), published in Management Science, run at university gyms with audio novels restricted to gym-only access. It's one of the more rigorously tested habit-formation ideas in popular circulation, though it was tested on one specific behavior (exercise) in one setting.

Does temptation bundling work if I just tell myself to only enjoy the "want" during the habit, without an actual restriction? The study's own data suggests that matters: the encouragement-only group (told to self-impose the rule) saw a much smaller, only marginally significant effect than the group with an actual access restriction. Self-discipline alone reproduced a weaker version of the effect than removing the option entirely.

What's a good "want" to bundle with a habit I'm avoiding? Based on the study design, something you'd enjoy but feel slightly guilty spending time on — an addictive audiobook, a guilty-pleasure show, a podcast you binge — paired with a habit that has a real payoff you don't feel immediately, and ideally with an actual restriction rather than just a personal rule.

Bottom line

Temptation bundling isn't just "make the boring thing more fun" — the study behind it found that restricting the tempting activity to only be available during the avoided habit worked meaningfully better than just encouraging people to pair the two on their own. If you're building a bundle, track the habit itself and whether the restriction held, not just whether the pairing felt enjoyable.

🔵🟢🟣 Track the habit and the restriction, not just the intention

TrakBit lets you run your "should" habit and your restriction check as separate lines, so you can see whether your combo actually follows the design the study tested.

  • Per-habit rings — your "should" and your restriction check, tracked separately.
  • Fogg Analytics — understand which cues actually sustain your combo.
  • No-punishment recovery — one week without the restriction doesn't erase the habit.
  • Privacy-first — your habit data is yours.

Download free on the App Store → (Coming soon to Google Play)

  • If you'd rather start with the smallest possible first step instead of engineering a full commitment device, The Tiny Habits Method explains that complementary approach.
  • If your physical environment is also competing against the bundle, Environment Design for Habits explains how to redesign it.
  • A real restriction is one form of external structure — asking someone else to hold you to it is another. What Is an Accountability Partner? explains the related mechanism.

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