This article originally appeared on Time.com.
Whether you have some extra weight in your upper arms or rear end, it makes sense that targeting those areas with exercise—curls for your arms, lunges for your —would slim them down.
Weight-loss experts refer to this as “spot reduction.” But it turns out that in most cases, this kind of laser-focused weight loss isn’t possible. One study in the Journal of Strength and Conditioning Research found that six weeks of intensive ab workouts did nothing to slim the exercisers’ midsections. A related study found that 12-weeks of one-armed workouts resulted in less loose skin in the trained arm, but zero loss.
Working out just one part of your body probably won’t slim it down, but some body parts are more likely to shed when you exercise. Your stomach is one of them.
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“Some deposits are more metabolically active than others, and those may be more responsive to exercise interventions,” says Arthur Weltman, a professor of medicine and chair of the department of kinesiology at the University of Virginia. “Abdominal in particular is one of the most metabolically active fats.”
When you exercise, your workouts trigger the release of hormones, Weltman explains. The higher the exercise intensity, the more of these hormones your body pumps out, and the more of that metabolically active you lose. (Some of Weltman’s research suggests that high intensity interval training (HIIT), in particular, may slim your midsection.)
If you have stored in your gut, arms and chest, a lot of your is metabolically active, so it will likely respond to exercise and diet changes, he says. That’s especially true of your abdominal . The bad news is that extra in these regions is also linked with a greater risk for diabetes, heart , and other ailments.
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On the other hand, if you store excess in the hips, and thighs, that is not metabolically active. You have a lower risk for many , "but that is very hard to reduce,” he says.
What type of exercise is best for targeting the tummy? One studycompared strength training to aerobic training in terms of reduction in different parts of the body and found that while aerobic training—running, swimming, cycling—led to greater whole-body loss, resistance training targeted abdominal in particular.
In a nutshell, spot-targeting isn't very effective—in most cases. But if you’re trying to lose around your stomach, a mix of resistance training and high-intensity aerobic exercise, along with a healthy diet, may help reduce your belly .