Can You Spot-Reduce Fat? What Studies Say About Targeted Fat Loss

Key takeaways

• A 2022 meta-analysis of 13 studies (1,158 people) found no spot-reduction effect: training a limb did not reduce the fat over it more than over the untrained limb.^[1]
• Six weeks of daily ab exercises made people stronger but did not change belly fat or waist size.^[2]
• When one leg was trained for 12 weeks, fat came off the arms and trunk, not the trained leg.^[4]
• A small 2023 trial in 16 men reported extra trunk fat loss with long ab endurance sessions; it has not been repeated.^[5]
• Aerobic exercise reduces visceral (deep belly) fat, even without dieting.^[6]

In short: Mostly no. When researchers train one body part and measure the fat over it, the fat usually does not shrink faster there than anywhere else: a 2022 pooled analysis of 13 studies and 1,158 people found no spot-reduction effect at all. Exercise still matters a lot, because it helps you lose fat from the whole body, including the belly, and it builds the muscle underneath. One small 2023 trial hinted at a local effect, so the door is not fully closed, but the practical advice has not changed.

If your real question is how to slim your middle, our practical guide on how to lose belly fat covers that step by step. This page answers a narrower question: can crunches, inner-thigh squeezes or arm toning burn the fat in that exact spot? Below we walk through the studies, explain why the idea refuses to die, and show what does change your shape.

Where the idea comes from

Spot reduction feels logical. When you do a lot of sit-ups, your stomach muscles get tired and warm, so it seems natural that they would use the fat right on top of them. Fitness marketing has leaned on that intuition for decades, with ab rollers, belly belts and “trouble zone” workouts. The authors of the 2022 review we describe below put the long life of the belief down to “wishful thinking and convenient marketing strategies”.

The body works differently. Fat is stored in fat cells all over the body, and when you burn more energy than you eat, hormones release fatty acids from fat stores into the blood, where any working muscle can use them. Which stores give up their fat is not simply decided by which muscle is moving. That is why the studies below compare a trained area with an untrained one in the same person: if spot reduction worked, the trained side should lose more.

What the studies found

Six weeks of ab exercises (2011). In a randomized trial at Brigham Young University, 24 sedentary adults were split into a control group and a group that did seven abdominal exercises, two sets of 10 repetitions, five days a week for six weeks, while everyone kept their usual calorie intake. The ab group got much stronger: they managed 47 curl-ups on average at the end, compared with 32 in the control group. But there was no significant change in body weight, body fat percentage, belly fat measured by scan, waist circumference or skinfolds.

Twelve weeks of training one arm (2007). A larger study had 104 men and women train only their non-dominant arm for 12 weeks. MRI, which measures fat along the whole upper arm, found the same fat change in the trained and untrained arms. Skinfold calipers suggested a small local loss in men only. The authors concluded that the MRI results support “the notion that spot reduction does not occur”.

Twelve weeks of training one leg (2013). In a Chilean study, 11 young adults did very long, light leg-press sets (960 to 1,200 repetitions per session) with one leg only, three times a week. Total body fat fell by 5.1%. But the fat did not come off the trained leg: it came off the arms and the trunk instead.

5.1%Whole body

10.2%Arms

6.9%Trunk

Training one leg for 12 weeks: where the fat came off

Item	Value
Whole body	5.1%
Arms	10.2%
Trunk	6.9%

Fat mass lost. The trained leg (and the untrained leg) showed no significant change in fat mass.

Source: Ramírez-Campillo R et al., Journal of Strength and Conditioning Research 2013 (11 adults, DXA scans) (checked on October 7, 2026)

The pooled evidence (2022). The same research group then gathered every suitable study that trained one limb and compared it with the other. Thirteen studies with 1,158 people aged 14 to 71 made the cut, giving 37 comparisons. Seventeen of them favored the trained limb and 20 favored the untrained one, which is about what you would expect from chance. The pooled effect was essentially zero, the studies agreed with each other, and there was no sign that missing studies skewed the result. Their conclusion: localized muscle training “had no effect on localized adipose tissue depots”.

The study that says “maybe”

To be fair to the other side: a 2023 randomized trial from Norway reported a local effect. Sixteen men with overweight either ran on a treadmill for 45 minutes, or ran for 27 minutes and then did torso rotations and crunches for the rest of the session, four days a week for 10 weeks, with energy use matched between groups. The ab group lost about 1.2 kg (7%) of trunk fat, while the running-only group showed no change in trunk fat. Total fat loss was similar in both groups (about 1.7 kg vs 1.1 kg), and the running group actually lost more body weight (2.3 kg vs 1.2 kg).

This is interesting, but it is one small trial in middle-aged men, and the ab work was long and continuous, closer to an endurance workout than a few sets of crunches. Until it is repeated in larger and more varied groups, it does not outweigh a meta-analysis of 13 studies. The fair summary is that any local effect, if it exists, is small, and it does not happen without overall fat loss.

So why do some people see a change in one spot?

Plenty of people swear that ab work flattened their stomach. Usually, several real things are happening at once:

• Overall fat loss. People who start an ab routine often change their eating and activity too. The belly shrinks because body fat fell everywhere.
• Stronger, firmer muscle. Trained muscles look and feel firmer, and stronger core muscles can change how you stand. That can change the outline without any fat loss.
• Less bloating. A flatter stomach in the morning often has more to do with gas and digestion than fat. Our guide to a flatter stomach covers the four things that change how a belly looks.
• Different photos. Light, posture and arm position change how a waist looks on camera. Our before-and-after photo explainer shows how.

What does reduce belly fat

The fat inside the belly, around the organs, is called visceral fat, and it is the kind most linked with heart disease and type 2 diabetes (our visceral fat guide explains why). The good news is that it responds well to whole-body exercise. A 2012 meta-analysis of 35 trials that measured visceral fat with CT or MRI found that aerobic exercise reduced it compared with no exercise, while resistance training alone did not show a significant effect. A 2013 review of 15 studies with 852 people found that exercise lowered visceral fat even without a calorie-cutting diet.

So the most reliable recipe for a smaller waist is not a special ab move. It is the combination that reduces body fat overall:

• A modest calorie deficit from an eating pattern you can keep. Our calorie deficit guide and calorie calculator help you estimate it.
• Regular aerobic activity, such as brisk walking. The Physical Activity Guidelines suggest 150 to 300 minutes of moderate activity a week.
• Strength training for the whole body on two or more days a week. It protects muscle while you lose weight: a 2021 overview of reviews found resistance training reduced lean-mass loss during weight loss by about 0.8 kg. See our strength training guide.
• Core work for strength, posture and comfort, not as a fat burner. Planks, carries and bird-dogs are worth doing for a strong back and middle.

Arms, thighs and the “stubborn” areas

The same rule applies to upper arms, inner thighs, hips and the bra-line. Training those muscles makes them stronger and firmer, which many people love, but the fat over them goes down when your overall body fat goes down. If one area seems slow to change, that is common and not a sign of failure. Keep going with the whole-body plan and measure progress in several ways; our list of ways to track progress without the scale can help on the weeks when the mirror does not seem to move.

What about fat freezing and other “spot” treatments?

Procedures such as cryolipolysis (fat freezing) and liposuction do remove fat from a chosen area. That is the one place where “spot reduction” is real, but it is cosmetic body contouring, not weight loss, and it does not replace the habits above. Our body contouring hub and non-surgical fat reduction compared explain the options, costs and limits. If weight loss is the goal, start at our lose weight hub.

The verdict

Spot reduction is mostly a myth. Decades of studies, pooled in 2022, show that training a body part does not burn the fat over it in any meaningful way, and the one recent trial that disagreed is small. That is not a reason to skip crunches or arm work: strong muscles help you move, protect your back and change your shape as body fat comes down. Just pair them with whole-body activity and a sustainable eating plan, and judge progress over weeks, not days. For more claims checked against the research, see our weight-loss myths roundup.

Questions to ask a professional

• Is my waist measurement in a range that raises my health risk?
• How much aerobic activity is safe for me to start with?
• Can you show me core exercises that are safe for my back?
• Is my bloating something that needs checking?

Frequently asked questions

Can crunches burn belly fat?

Not on their own. In a six-week trial, daily ab exercises improved strength but did not change belly fat, body fat percentage or waist size. Belly fat goes down with overall fat loss from eating and whole-body activity.

Is spot reduction completely a myth?

Almost. A 2022 meta-analysis of 13 studies found no effect. One small 2023 trial in 16 men reported more trunk fat loss with long ab endurance sessions, but it needs repeating before it changes the advice.

Why do my arms or thighs lose fat last?

In the studies, training a limb did not make its own fat shrink faster; fat came off the body as a whole. Some areas simply take longer to show it. Keep up whole-body exercise and a steady calorie deficit.

What is the best exercise for visceral fat?

Aerobic exercise such as brisk walking, cycling or swimming has the clearest evidence for reducing visceral fat in trials. Strength training adds muscle and helps keep it while you lose weight.

Do fat-freezing or liposuction count as spot reduction?

They remove fat from a chosen area, but they are cosmetic body contouring, not weight loss, and they do not replace healthy habits. Ask a board-certified provider about results, risks and costs.

References

1. Ramirez-Campillo R, Andrade DC, Clemente FM, Afonso J, Pérez-Castilla A, Gentil P. A proposed model to test the hypothesis of exercise-induced localized fat reduction (spot reduction), including a systematic review with meta-analysis. Human Movement, 2022. doi:10.5114/hm.2022.110373 (accessed October 7, 2026) Meta-analysis
2. Vispute SS, Smith JD, LeCheminant JD, Hurley KS. The effect of abdominal exercise on abdominal fat. Journal of Strength and Conditioning Research, 2011. doi:10.1519/JSC.0b013e3181fb4a46 · PMID 21804427 (accessed October 7, 2026) Randomized trial
3. Kostek MA, Pescatello LS, Seip RL, et al.. Subcutaneous fat alterations resulting from an upper-body resistance training program. Medicine and Science in Sports and Exercise, 2007. doi:10.1249/mss.0b0138058a5cb · PMID 17596787 (accessed October 7, 2026) Other
4. Ramírez-Campillo R, Andrade DC, Campos-Jara C, et al.. Regional fat changes induced by localized muscle endurance resistance training. Journal of Strength and Conditioning Research, 2013. doi:10.1519/JSC.0b013e31827e8681 · PMID 23222084 (accessed October 7, 2026) Other
5. Brobakken MF, Krogsaeter I, Helgerud J, et al.. Abdominal aerobic endurance exercise reveals spot reduction exists: A randomized controlled trial. Physiological Reports, 2023. doi:10.14814/phy2.15853 · PMID 38010201 (accessed October 7, 2026) Randomized trial
6. Ismail I, Keating SE, Baker MK, Johnson NA. A systematic review and meta-analysis of the effect of aerobic vs. resistance exercise training on visceral fat. Obesity Reviews, 2012. doi:10.1111/j.1467-789X.2011.00931.x · PMID 21951360 (accessed October 7, 2026) Meta-analysis
7. Vissers D, Hens W, Taeymans J, et al.. The effect of exercise on visceral adipose tissue in overweight adults: a systematic review and meta-analysis. PLoS One, 2013. doi:10.1371/journal.pone.0056415 · PMID 23409182 (accessed October 7, 2026) Meta-analysis
8. Bellicha A, van Baak MA, Battista F, et al.. Effect of exercise training on weight loss, body composition changes, and weight maintenance in adults with overweight or obesity: An overview of 12 systematic reviews and 149 studies. Obesity Reviews, 2021. doi:10.1111/obr.13256 · PMID 33955140 (accessed October 7, 2026) Review
9. Physical Activity Guidelines for Americans, 2nd edition: Executive Summary. U.S. Department of Health and Human Services, 2018. (accessed October 7, 2026) Guideline
10. Assessing Your Weight and Health Risk. National Heart, Lung, and Blood Institute (NIH). (accessed October 7, 2026) Government page
11. The Truth Behind Weight Loss Ads. Federal Trade Commission. (accessed October 7, 2026) Government page

Facts checked on October 7, 2026

Educational information, not medical advice. Talk with a qualified healthcare professional about your own situation. In an emergency call 911.