Can You Make Exercise Easier to Want?

Introduction

Temptation bundling makes exercise easier to want by reserving something immediately enjoyable for the workout itself. Instead of relying only on distant benefits such as better health or fitness, the strategy gives exercise a reward available now: the next chapter of a gripping audiobook, for example. The crucial feature is the link between the two — ideally, the enjoyable activity is unavailable unless the exercise happens.

The best-known experiment found a striking short-term effect when researchers literally kept participants’ tempting audiobooks at the gym. But it also revealed an important weakness: the advantage faded with time and was largely lost after a Thanksgiving closure interrupted the routine. A much larger later experiment found smaller but more durable gains under less restrictive, more realistic conditions. Together, the studies suggest that temptation bundling can help, but should be understood as a way of redesigning exercise’s immediate reward rather than as a permanent cure for inconsistent motivation.[PubMed Central (PMC)]pmc.ncbi.nlm.nih.govPubMed Central (PMC)Holding the Hunger Games Hostage at the Gym: An Evaluation of Temptation Bundling - PMCFebruary 1, 2014…Published: February 1, 2014

How temptation bundling changes the reward for exercise

Exercise presents an awkward timing problem. Many of its strongest reasons — improved cardiovascular health, greater fitness or changes in body composition — arrive gradually. The costs are immediate: getting changed, travelling to the gym, exerting yourself and giving up time that could be spent on something more immediately pleasurable.

Temptation bundling changes that timing without trying to make the delayed benefits arrive sooner. It attaches a “want” with immediate appeal to a “should” whose principal payoff lies in the future. Researchers describe this as a response to present bias, our tendency to give disproportionate weight to rewards and costs occurring now.[ScienceDirect]sciencedirect.comScienceDirect Teaching temptation bundling to boost exercise: A field experimentTeaching temptation bundling to boost exercise: A field experiment - ScienceDirect…

That distinguishes a genuine temptation bundle from simply rewarding yourself occasionally. If an audiobook is available whenever you want it, it may make a workout more pleasant when you happen to exercise, but it provides little reason to start exercising. If the rule becomes “I only listen to this series while exercising”, wanting the next chapter creates an additional reason to begin the next session. Exercise has effectively become the gateway to something desirable.

There is broader evidence for the importance of this immediate-reward mechanism. Research by Kaitlin Woolley and Ayelet Fishbach found that immediate rewards such as enjoyment were more strongly associated with persistence in long-term goals than delayed rewards, even though people commonly reported pursuing activities such as exercise because of those delayed benefits. Other experiments found that directing people towards the more enjoyable exercise could increase persistence compared with concentrating on which option was most useful for their longer-term goal.[sagepub.com]journals.sagepub.comSage Journals Immediate Rewards Predict Adherence to Long-Term GoalsSage JournalsImmediate Rewards Predict Adherence to Long-Term Goals - Kaitlin Woolley, Ayelet Fishbach, 2017November 29, 2016…Published: November 29, 2016

This gives temptation bundling a particularly useful role within environment design. The environment is not merely removing a temptation. It is relocating the temptation so that indulging in it supports the desired behaviour. Entertainment that might otherwise compete with a workout becomes part of the reason to do one.

What the gym audiobook experiment actually found

The original field experiment by Katherine Milkman, Julia Minson and Kevin Volpp, published in Management Science, turned this idea into an unusually literal commitment device. The study recruited 226 students, faculty and staff at a large north-eastern US university in 2011. Participants already belonged to the university gym and typically exercised using stationary aerobic equipment. They were randomly assigned to three groups.[PubMed Central (PMC)]pmc.ncbi.nlm.nih.govPubMed Central (PMC)Holding the Hunger Games Hostage at the Gym: An Evaluation of Temptation Bundling - PMCFebruary 1, 2014…Published: February 1, 2014

The full temptation-bundling group selected several highly tempting audio novels. The audiobooks were loaded onto an iPod that researchers kept in a locked locker at the university gym. Participants could use it during exercise but could not take it home. In other words, the researchers did not merely advise them to save the stories for workouts: they engineered the environment so that continuing the story required returning to the gym.[PubMed Central (PMC)]pmc.ncbi.nlm.nih.govPubMed Central (PMC)Holding the Hunger Games Hostage at the Gym: An Evaluation of Temptation Bundling - PMCFebruary 1, 2014…Published: February 1, 2014

An intermediate group also received tempting audiobooks and was encouraged to restrict listening to exercise, but its members kept their own devices and therefore had to enforce the rule themselves. The control group received a Barnes & Noble gift card chosen to be perceived as similarly valuable, alongside reminders about the health benefits of exercise.[PubMed Central (PMC)]pmc.ncbi.nlm.nih.govPubMed Central (PMC)Holding the Hunger Games Hostage at the Gym: An Evaluation of Temptation Bundling - PMCFebruary 1, 2014…Published: February 1, 2014

At the beginning, the differences were substantial. After adjusting for relevant baseline measures, the full-treatment group made an estimated 0.48 additional gym visits per week in the first week, a 51% increase relative to the control group’s estimated 0.94 visits. The intermediate intervention produced an estimated 29% increase, although that result was weaker statistically. Across the seven weeks before Thanksgiving, participants made an average of 7.8 gym visits in the full-treatment group, 6.5 in the intermediate group and 6.1 in the control group.[PubMed Central (PMC)]pmc.ncbi.nlm.nih.govPubMed Central (PMC)Holding the Hunger Games Hostage at the Gym: An Evaluation of Temptation Bundling - PMCFebruary 1, 2014…Published: February 1, 2014

The comparison between the two treatment groups is particularly revealing. The strongest version did more than provide entertainment: it created an external restriction. Participants could not casually break their own rule on a quiet evening at home because the audiobook was physically inaccessible. The intermediate version depended on self-enforcement and produced a smaller initial difference. That fits the wider environment-design principle that changing access can be more dependable than repeatedly asking yourself to make the preferred choice.

There was also evidence that people valued the restriction rather than merely tolerating it. At the end of the experiment, 61% chose to pay for gym-only access to tempting audiobooks when offered the opportunity. In effect, many participants were willing to sacrifice unrestricted access to entertainment because they believed the restriction could help them exercise.[PubsOnLine]pubsonline.informs.orgHolding the Hunger Games Hostage at the Gym: An Evaluation of Temptation Bundling | Management ScienceNovember 6, 2013…Published: November 6, 2013

The study nevertheless has limits. It was small and drew from a university population already holding gym memberships and generally accustomed to stationary aerobic exercise. Gym attendance was recorded, but the researchers could not directly establish how much exercise participants completed during every recorded visit. The authors therefore treated the findings as an initial field demonstration rather than evidence that temptation bundling would work identically for everyone or every form of exercise.[PubMed Central (PMC)]pmc.ncbi.nlm.nih.govPubMed Central (PMC)Holding the Hunger Games Hostage at the Gym: An Evaluation of Temptation Bundling - PMCFebruary 1, 2014…Published: February 1, 2014

Thanksgiving exposed the bundle’s weak point

The most instructive result may be what happened later. The advantage of the full temptation bundle declined by an estimated 0.07 gym visits per week as the study progressed. Then the university’s Thanksgiving break closed the gym and forcibly separated participants from both their workout setting and their bundled audiobooks. After the interruption, the treatment advantage effectively disappeared.[PubMed Central (PMC)]pmc.ncbi.nlm.nih.govPubMed Central (PMC)Holding the Hunger Games Hostage at the Gym: An Evaluation of Temptation Bundling - PMCFebruary 1, 2014…Published: February 1, 2014

This complicates the appealing idea that a few weeks of temptation bundling automatically creates a durable exercise habit. In this experiment, the attraction of returning for the next instalment appears to have been sensitive to interruption. The researchers proposed that time away from the stories may have reduced participants’ appetite for them. Once people had stopped listening for a while, finding out what happened next may simply have felt less urgent.[PubMed Central (PMC)]pmc.ncbi.nlm.nih.govPubMed Central (PMC)Holding the Hunger Games Hostage at the Gym: An Evaluation of Temptation Bundling - PMCFebruary 1, 2014…Published: February 1, 2014

Milkman has subsequently highlighted the episode as an example of how disruption can work against behaviour that was already progressing well. A holiday, illness, journey or gym closure does not merely eliminate several exercise opportunities: with temptation bundling it can also interrupt consumption of the enjoyable activity supplying some of the immediate motivation.[American Psychological Association]apa.orgOpen source on apa.org.

That failure mode suggests an important distinction. Temptation bundling is not necessarily habit formation. While the bundle is attractive, it can change the immediate calculation surrounding a workout. But if the attractive component loses its pull, the exercise behaviour does not automatically survive. A person who finishes a favourite series, loses interest in a podcast or spends three weeks away from their usual routine may need a new bundle rather than assuming the old one will restart itself.

A larger experiment found smaller but longer-lasting gains

The original experiment deliberately imposed a strong restriction. Later researchers asked a more practical question: could people benefit simply from being taught the idea and allowed to manage the bundle themselves?

A 2020 field experiment led by Erika Kirgios studied 6,792 members of 24 Hour Fitness, making it roughly 30 times the size of the original 226-person study. Participants joined a four-week programme intended to encourage exercise. Depending on their randomly assigned condition, they received an audiobook and encouragement to temptation bundle, an audiobook without that explicit encouragement, or neither. Unlike the locked-iPod experiment, people were not technically prevented from listening elsewhere.[ScienceDirect]sciencedirect.comScienceDirect Teaching temptation bundling to boost exercise: A field experimentTeaching temptation bundling to boost exercise: A field experiment - ScienceDirect…

The effects were less dramatic than the original 51% first-week increase, but they proved more durable. Providing an audiobook alongside encouragement to temptation bundle increased the probability of making a weekly gym visit by roughly 10–14% and average weekly workouts by about 10–12%, with effects detected during the programme and as far as 17 weeks afterwards.[ScienceDirect]sciencedirect.comScienceDirect Teaching temptation bundling to boost exercise: A field experimentTeaching temptation bundling to boost exercise: A field experiment - ScienceDirect…

Intriguingly, explicit instruction was not doing all the work. Simply receiving a free audiobook as part of an exercise programme also increased gym attendance. Follow-up research suggested that many people inferred the intended connection: if a gym gives you an audiobook, perhaps you are supposed to listen while exercising. Explicitly teaching temptation bundling added only a modest advantage over providing the audiobook itself.[Wharton Faculty Platform]faculty.wharton.upenn.eduOpen source on upenn.edu.

The contrast with the first experiment is useful rather than contradictory. The 2014 study tested a strong, externally enforced bundle in a small university sample and found a large initial effect that collapsed around a major interruption. The 2020 experiment tested a lighter-touch, self-managed approach in thousands of commercial-gym members and found smaller gains that lasted for months. The later researchers noted that 24 Hour Fitness locations rarely closed and participants entered the programme at different points over roughly a year, meaning that any holiday-related disruptions were dispersed rather than hitting virtually everyone simultaneously.[ResearchGate]researchgate.netOpen source on researchgate.net.

Making a temptation bundle that can survive real life

The evidence does not establish a single optimal recipe, but it does make the logic of a useful exercise bundle fairly clear. The enjoyable component needs to be genuinely attractive, compatible with the workout and sufficiently restricted that exercise retains some privileged access to it.

An audiobook, serialised podcast or television programme can fit especially well because unfinished narratives create a natural reason to return. But exclusivity matters. Listening to the same audiobook throughout the day weakens the connection between wanting the story and starting a workout. The original experiment’s locked devices represented the strongest possible version of the rule; the later study suggests that people can also benefit from self-imposed restrictions without elaborate enforcement.[PubMed Central (PMC)]pmc.ncbi.nlm.nih.govPubMed Central (PMC)Holding the Hunger Games Hostage at the Gym: An Evaluation of Temptation Bundling - PMCFebruary 1, 2014…Published: February 1, 2014

The disruption findings also suggest treating the bundle as something that may need maintenance. After a holiday, illness or long journey, the question is not simply whether to “get motivated again”. It may be whether the immediate reward still has enough pull. If not, choosing a fresh audiobook, programme or other compatible pleasure may recreate the attraction that the original bundle has lost.

That is a narrower and more credible promise than saying temptation bundling makes exercise effortless. It does not remove the physical work, guarantee a lasting habit or replace reasons to exercise. What it can do is change the immediate environment around the decision: instead of sacrificing something enjoyable in order to work out, the workout becomes the occasion on which the enjoyable thing is available. The two major field experiments suggest that this relatively simple rearrangement can increase gym attendance — while the Thanksgiving interruption provides an equally valuable warning that the motivational link can weaken when the routine connecting pleasure and exercise is broken.[PubMed Central (PMC)]pmc.ncbi.nlm.nih.govPubMed Central (PMC)Holding the Hunger Games Hostage at the Gym: An Evaluation of Temptation Bundling - PMCFebruary 1, 2014…Published: February 1, 2014

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Endnotes

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