The short answer: feeling connected to your future self is linked to healthier choices, and one experiment found that a two-minute exercise in imagining your 20-years-older self raised how much people exercised over the following days. But a picture of your dream body is not a workout plan. The research is clear that motivation alone rarely changes behavior. Plans, obstacles you have thought through in advance, and tracking are what turn a vivid goal into actual sessions in the gym.
We build an app whose signature feature is a preview of your future self, so we have a stake in this question. That is exactly why we wanted to read the studies closely, including the ones that do not flatter the idea. Here is what they say.
Why your future self can feel like a stranger
Psychologist Hal Hershfield's work starts from a simple observation: many people think about their future self the way they think about another person. When the future you feels distant and vague, sacrificing for them (saving money, skipping the second dessert, getting up for a 6 a.m. workout) feels like doing a favor for a stranger.
His review of the research concludes that people make more future-friendly choices when their future self feels similar to who they are now, is pictured vividly and realistically, and is viewed positively.[2] Researchers call this "future self-continuity."
The study that tested exercise directly
Most future-self research is about money. The clearest test on exercise comes from a 2018 paper in the Journal of Experimental Psychology: Applied.[1]
In the first study, 191 adults who felt more connected to their future self reported better general, physical and mental health. That is a correlation, so it cannot show which causes which.
The second study was an experiment. Students wrote a short letter either to themselves 20 years in the future or to themselves three months in the future. They then logged their exercise daily.
This is encouraging, but modest. The exercise was self-reported, the follow-up was short, the results were only just statistically significant, and the comparison was a distant future self against a near one, not against doing nothing. It also involved writing, not images.
What about actually seeing your future self?
Here the evidence gets more interesting, and thinner. The best-known image study is about money, not muscles. In a 2011 series of experiments, Hershfield and colleagues showed people digitally aged renderings of their own face.[3]
The samples were small and the money was hypothetical, so treat it as a proof of concept. It shows that a realistic image of your future self can shift choices in the moment.
Closer to fitness, a handful of studies point in the same direction:
- Avatars that change with your effort. In virtual-reality lab experiments, people whose own avatar visibly slimmed down as they exercised went on to exercise more than those with an unchanging avatar. Seeing your own avatar run also led to more exercise in the next 24 hours than seeing someone else's.[4]
- Imagining a possible self. In a trial of 80 inactive students, those asked to imagine themselves as a healthy, regular exerciser reported more exercise at 4 and 8 weeks than a control group. So did those who imagined a feared inactive self.[5]
- It depends on the person. A study of 152 students found that future-self images raised exercise mainly in people who already think a lot about future consequences.[6]
- A future-body image for weight loss. In a 2017 trial, 145 adults with overweight received a computer-generated image of their future body shape. Those who got it at week 8 lost weight faster than those who got it at the start. There was no group without an image, so the study cannot show the image itself helped, and one author held rights to the app used.[7]
Where a dream-body picture can backfire
Two lines of research are worth knowing before you set a goal-body image as your lock screen.
Fantasizing can replace effort. Across four studies, psychologist Gabriele Oettingen found that positive expectations (believing you can get there) predicted more effort and better results, while positive fantasies (enjoying the imagined outcome) predicted less effort and worse results.[8] Daydreaming about the finish line can feel so good that it takes the edge off the drive to start.
Idealized bodies can hurt body image. In an experiment with 130 young women, those who viewed Instagram "fitspiration" images reported more body dissatisfaction, worse mood and lower appearance self-esteem than women who viewed travel photos.[9] Those were other people's bodies, not a preview of your own, but the risk of unhelpful comparison is real.
What actually turns motivation into workouts
One of the most useful findings for anyone building a habit comes from a 2002 trial of 248 people. A program designed to raise motivation to exercise did raise intentions, but it did not change how much people actually exercised. Adding a simple plan for when and where they would work out had a large effect.[10]
These planning techniques have the strongest evidence:
- If-then plans. "If it is Monday, Wednesday or Friday at 6 p.m., then I go straight from work to the gym." A meta-analysis of 94 tests found a medium-to-large effect on reaching goals (d = 0.65).[11]
- Picture the goal, then the obstacle. Known as mental contrasting, this means imagining the outcome you want, then the specific thing most likely to stop you, then your if-then plan for it. In a four-month trial with 256 women, this approach made them about twice as active as an information-only group, nearly an hour more each week.[12]
- Vivid, personal goal imagery, done with a plan. Functional imagery training teaches people to vividly imagine their own goals and the steps toward them.
Tracking helps too, with a caveat. A systematic review of 22 studies found a consistent link between self-monitoring (logging food, exercise or weight) and weight loss, though the authors rated the quality of evidence as weak.[14]
How long until it sticks?
You have probably heard that habits take 21 days, or 66. The real answer is that it varies enormously. In the best-known study, 96 volunteers repeated a daily eating, drinking or activity habit for 12 weeks. The time it took to become close to automatic ranged from 18 to 254 days, and missing a single day did not meaningfully set anyone back.[15]
A 2024 systematic review of 20 studies and 2,601 people found median times of about 59 to 66 days, with individual times anywhere from 4 to 335 days.[16] Plan for months, not weeks, and do not quit because week three still feels hard.
How to use a Future You image, based on the evidence
- Use it to feel connected, not to compare. Treat the image as a reminder of the person you are building toward and what you want to be able to do, not as a standard you are failing to meet today.
- Follow it with a plan straight away. After you look at it, write one if-then plan for this week: the day, time and place of your next three sessions.
- Name your obstacle. Picture the goal, then the most likely thing to derail you (late meetings, low energy, travel), then what you will do when it happens.
- Track a few things, not everything. Sessions completed, protein, and a weekly weigh-in are enough to see whether the plan is working.
- Expect months. Revisit your preview every few weeks to compare it with real progress, and adjust the plan rather than the goal.
- Stop if it makes you feel worse. Motivation that comes from shame rarely lasts. If any body image triggers unhealthy thoughts about food or your body, step away from it and talk to a professional.
How NewYou puts this into practice
This research is why Future You never shows up on its own in NewYou. It sits next to a training plan, a daily fuel plan and a weekly check-in, so the image is always paired with the next concrete step. It is built from your own photo and the goal and pace you choose, and it keeps your face as your own. We describe it as an illustration for motivation, not a prediction, because that is what the evidence supports.
Still choosing your direction? Read cut, bulk, or maintain. Curious what happens to your selfie? See how we handle your photos.
This article is general information, not medical advice. Talk to a qualified healthcare provider before starting a new exercise or nutrition program, especially if you have a health condition or a history of disordered eating.