Lifting Weights Burns Fat Too: New Research Challenges Cardio’s Fat-Loss Crown
For years, fitness culture has promoted a simple idea: if you want to lose body fat, do cardio.
Running, cycling, rowing, and long treadmill sessions have traditionally been viewed as the gold standard for fat loss. Weight training, meanwhile, has often been placed in a separate category — something you do primarily to build muscle and strength.
But recent research is beginning to challenge that distinction.
A growing number of studies suggest that resistance training can reduce body fat percentage nearly as effectively as cardio, especially when overall training volume is matched. In some cases, lifting weights may offer additional advantages by helping preserve or even build muscle while body fat decreases.
The findings are reshaping how researchers and coaches think about fat loss, body composition, and exercise programming.
The message is not that cardio is ineffective. Rather, it is that resistance training may deserve far more credit as a fat-loss tool than it traditionally receives.
Why Cardio Became The Fat-Loss King
The belief that cardio is superior for fat loss seems logical.
Cardio burns a large number of calories during the activity itself. A hard run or cycling session can create a significant energy expenditure in a relatively short period of time.
Weight training typically burns fewer calories during the workout.
Because fat loss fundamentally requires an energy deficit, many people assumed cardio must automatically be the better choice.
But this perspective focuses only on calories burned during exercise.
Modern research is increasingly showing that body composition changes involve much more than the calories displayed on a treadmill screen.
The New Research
A recent systematic review and meta-analysis published in the Journal of the International Society of Sports Nutrition compared aerobic training, resistance training, and concurrent training (a combination of both) for body fat reduction. Researchers analyzed decades of randomized controlled trials involving healthy adults.
The findings were surprising.
While aerobic training often produced slightly greater reductions in absolute fat mass, all exercise modalities showed similar effectiveness when it came to reducing body fat percentage.
That distinction matters.
Body fat percentage reflects the proportion of your body composed of fat relative to everything else, including muscle, bone, and organs.
Two people can lose the same amount of fat mass while ending up with very different body fat percentages depending on how much muscle they maintain.
This is where resistance training becomes particularly interesting.
Fat Loss Is Not The Same As Weight Loss
One of the biggest misconceptions in fitness is treating weight loss and fat loss as the same thing.
They are not.
The number on a scale measures everything:
fat,
muscle,
water,
glycogen,
and other tissues.
Body composition tells a different story.
A person who loses 5 kilograms may lose:
mostly fat,
mostly muscle,
or a combination of both.
From a health and physique perspective, those outcomes are dramatically different.
Resistance training appears especially valuable because it helps preserve lean mass while reducing body fat.
Several meta-analyses have shown that resistance training not only decreases body fat percentage but also maintains or increases muscle mass during weight-loss interventions.
Cardio alone does not always provide the same protection.
Why Body Fat Percentage Matters More
Most people do not actually want to become lighter.
They want to become leaner.
There is an important difference.
Imagine two individuals both lose 10 kilograms.
Person A loses:
7 kilograms of fat,
3 kilograms of muscle.
Person B loses:
8 kilograms of fat,
gains 1 kilogram of muscle.
The scale may show similar results, but their physiques, metabolic health, and body composition will look completely different.
This is why many researchers now argue that body fat percentage may be a more useful outcome than body weight alone.
Resistance training seems particularly effective at improving this metric because it attacks both sides of the equation:
reducing fat,
while preserving muscle.
Muscle Changes The Equation
One reason lifting weights may rival cardio for body fat percentage reduction is muscle retention.
When people diet without resistance training, some muscle loss is almost inevitable.
Losing muscle can:
reduce strength,
negatively affect physical function,
and lower resting energy expenditure.
Resistance training helps minimize these effects.
Research involving individuals with overweight and obesity found that resistance-based exercise programs consistently reduced body fat percentage while increasing lean mass. In fact, resistance training alone was among the most effective exercise methods for building or preserving muscle during fat-loss interventions. (PubMed)
This creates a body composition advantage that simple calorie-burning calculations fail to capture.
The Afterburn Effect
Another reason weight training contributes to fat loss is excess post-exercise oxygen consumption, often called the "afterburn effect."
Following resistance training, the body continues using energy to:
repair muscle tissue,
restore glycogen,
and recover from training stress.
This elevated energy expenditure can persist long after the workout ends.
The effect is often exaggerated online, but it is real.
Unlike cardio, where most calorie expenditure occurs during the session itself, resistance training creates additional recovery demands afterward.
Combined over weeks and months, these effects contribute to changes in body composition.
The Best Exercise Is The One You Actually Do
One practical implication of this research is adherence.
Many people dislike traditional cardio.
Some find running repetitive.Others experience joint discomfort.Some simply enjoy lifting more.
For years, these individuals often felt forced to choose between:
training they enjoy,
and training they believed was necessary for fat loss.
The newer evidence suggests that choice may be less dramatic than previously thought.
If someone consistently performs resistance training and maintains an appropriate calorie intake, significant body fat reduction is absolutely possible.
Long-term consistency frequently matters more than choosing the theoretically perfect exercise modality.
Does This Mean Cardio Is Useless?
Not even close.
Cardio still provides enormous benefits.
Aerobic exercise remains one of the most effective tools for:
improving cardiovascular health,
increasing endurance,
enhancing VO₂ max,
and burning calories efficiently.
Several recent analyses still found aerobic training slightly superior for reducing total fat mass. (Frontiers)
The point is not that resistance training beats cardio.
The point is that resistance training appears far more competitive than many people assumed.
The old belief that lifting is only for muscle while cardio is only for fat loss does not align well with current evidence.
The Combination Approach May Still Win
Interestingly, many studies suggest the strongest overall body composition outcomes often occur when resistance training and cardio are combined.
This combination allows people to:
improve cardiovascular fitness,
maintain muscle,
increase calorie expenditure,
and reduce body fat.
For general health, this remains a highly effective strategy.
However, not everyone has unlimited training time.
If someone only has three or four weekly sessions available, the research suggests resistance training can still be a powerful fat-loss tool on its own.
What Most People Get Wrong About Fat Loss
The exercise debate often distracts from a larger reality.
Diet remains the primary driver of fat loss.
Neither cardio nor weight training can consistently overcome a calorie surplus.
Exercise helps.Nutrition determines most of the outcome.
The most effective fat-loss programs usually combine:
a sustainable calorie deficit,
adequate protein intake,
resistance training,
quality sleep,
and long-term consistency.
The idea that endless cardio is required for fat loss is becoming increasingly outdated.
The Takeaway
The latest evidence is challenging one of fitness culture’s most persistent assumptions.
Cardio is not the only effective way to reduce body fat.
Resistance training can lower body fat percentage to a surprisingly similar degree while offering additional benefits for muscle retention, strength, and body composition.
That does not mean cardio should disappear from training programs.
It means the gap between lifting and cardio for fat loss may be much smaller than people thought.
If you enjoy running, keep running.
If you prefer lifting weights, you do not need to feel like you are choosing the "wrong" tool for fat loss.
The science increasingly suggests both approaches can work.
And for many people, building muscle while getting leaner may be one of the most effective fitness combinations available.
References
Lafontant K, et al. Comparison of concurrent, resistance, or aerobic training on body fat loss: a systematic review and meta-analysis. Journal of the International Society of Sports Nutrition. 2025.
Wewege M, et al. The Effect of Resistance Training in Healthy Adults on Body Fat Percentage, Fat Mass and Visceral Fat: A Systematic Review and Meta-Analysis. Sports Medicine. 2021.
Lopez P, et al. Resistance training effectiveness on body composition and body weight outcomes in individuals with overweight and obesity across the lifespan: A systematic review and meta-analysis. Obesity Reviews. 2022.
Huang T, et al. Effects of exercise on body fat percentage and cardiorespiratory fitness in sedentary adults: a systematic review and network meta-analysis. Frontiers in Public Health. 2025.