Cardio vs. Strength Training: Which Is Better for Shrinking Middle-Age Belly Fat?
If you’re battling a middle-aged belly bulge, you’re certainly not alone. Belly fat becomes more common in men over 40, mainly due to hormonal shifts, such as reduced testosterone and a rise in insulin. On top of that, a slowing metabolism makes it easier for fat to accumulate in the abdomen, says Ben LaNeve, CPT, and personal training lead at Life Time Annapolis. To help you shed stubborn fat and reclaim your waistline, we spoke with fitness experts to optimize your workout routine and answer one critical question: What’s more effective for melting belly fat—cardio or strength training?
“As we reach midlife…we lose muscle and our hormones change,” LaNeve tells Men's Journal. “This means we burn fewer calories, even at rest, and it becomes easier to gain weight. To keep metabolism active, workouts should shift to include more strength training to maintain muscle, regular cardio for heart health, and a focus on staying consistent rather than just pushing harder.”
But which workout modality reigns supreme? We learned the pros and cons of each, and ultimately, which is the best option to tame, trim, and tighten your midsection.
The Pros and Cons of Cardio
Running comes with a long list of benefits, from improved cardiovascular health to reduced body fat. But like any workout style, it has its drawbacks, too. Below, we break down the pros and cons of this cardio-first approach.
Pros
It Checks a Lot of Boxes
What does this mean, exactly?
“Cardio can touch on some basic strength principles (Hello, quads on the Stairmaster!) as well as general movement longevity (achieving the magical 10,000 step mark). So in short, cardio can provide some serious bang for your buck when there is some thought put into it,” explains Casey Lee, owner and certified personal trainer at Purposeful Strength, LLC.
It Boosts Calorie Expenditure
Engaging in regular cardio is a productive way to burn calories and melt fat.
“Aerobic exercise effectively reduces visceral belly fat (around the organs) by increasing calorie expenditure and improving insulin sensitivity,” explains LaNeve.
Caveats
It’s Time-Consuming
“For long-term aerobic gains to happen, we want to start accumulating upwards [of] three hours of moderate intensity cardio,” Lee tells us. “For some, finding three hours a week in total can be challenging. If you’re trying to burn stubborn body fat, time in the gym needs to be a proactive factor.”
Related: Running on a Treadmill vs. Outdoors: What’s More Effective?
The Pros and Cons of Strength Training
Unlike cardio, which primarily boosts heart health and burns calories, strength training focuses on building muscle and improving overall body composition. But it’s not for everyone. Here, we break down the key benefits and potential drawbacks of this muscle-first approach.
Pros
It Delivers Results With Minimal Equipment
You heard that right! You don’t necessarily need a pricey gym membership or at-home machines in order to get into shape.
“A vast majority of my clients utilize adjustable dumbbells and their body weight to achieve strength gains that can help reshape and recompose their bodies,” Lee says.
It Builds and Preserves Lean Muscle
If you want to fast-track muscle growth, strength training is the name of the game. (After all, muscle burns more calories than fat!)
“[This form of exercise] builds and maintains lean muscle mass, which elevates resting metabolic rate and counteracts age-related muscle loss,” LaNeve points out.
It Sets You Up for an All-Day Calorie Burn
Whether lifting weights or training with your body weight, performing strength exercises will set you up for an efficient, all-day calorie burn.
“[Strength training] builds muscle, boosts your metabolism, and helps balance out the hormones that start dropping as you get older—it doesn’t burn as many calories on the spot, but it sets you up to burn more all day,” explains Kai Zimmer, lead trainer at Fred Fitness.
Caveats
It’s Technical
One downside to strength training, according to Lee? It’s “technical.” In other words, you need to pay attention to your form and the weights you’re working with.
“For cardio, you can walk for 60 minutes and check the boxes; however, strength has a few more rules for fat loss,” Lee explains. “Progressively increasing reps and/or weights and monitoring rest intervals to promote muscle growth becomes a factor when you’re trying to burn off those last few areas of stubborn fat.”
Cardio vs. Strength Training: Which Is More Effective for Burning Belly Fat?
It’s clear that cardio and strength training each promote fat loss in their own way. But when you’re deciding which is more effective to focus on, experts agree there’s a clear winner.
“Strength training is king when it comes to ‘reshaping’ your body,” Lee says. “Cardio can make you look like a smaller version of yourself, so yes, your waistline will shrink. However, when it comes to changing the way your body looks—including a smaller waist—strength training builds the muscle that shapes your body.”
LaNeve advocates for strength training due to its many benefits: increased metabolic rate, sustained lean muscle, and healthy aging.
“When it comes to shrinking the waistline, all forms of strength training have value, but circuit-style resistance training and compound movements—whether using bodyweight, moderate weights, or heavy lifting—are especially effective,” LaNeve tells us. “Circuit training combines strength and elevated heart rate for greater calorie burn, while heavy lifting builds lean muscle that boosts metabolism. Bodyweight strength is highly accessible and improves core stability. The key is consistency and progressive overload—challenging the muscles over time to stimulate fat loss and reshape the midsection.”
If time is tight and you only have 30 minutes to dedicate to your workout, Zimmer stresses “intensity is everything.” Circuit-style strength training—which torches fat while building muscle—is key.
“It’s like running the gauntlet: five compound moves back-to-back—think dumbbell squats, push-ups, rows, kettlebell swings, and mountain climbers—40 seconds on, 20 seconds off, for four total rounds,” Zimmer says. “It’s efficient, relentless, and insanely effective for carving out the waistline.”
But your routine shouldn’t stop there. LaNeve and Lee point out the importance of following a nutritious diet and certain healthy lifestyle habits.
“Exercise alone isn’t enough—habits like sleep, stress management, and diet strongly influence whether cardio or strength training actually leads to fat loss,” LaNeve explains. “Poor sleep and high stress raise cortisol, a hormone linked to belly fat storage. A diet high in protein and whole foods fuels workouts and supports recovery. Without these foundations, even the best training plan can fall short of waistline results.”
Related: 6x Mr. Olympia Shares the 3 Leg-Day Moves Every Man Needs for Bigger, Stronger Legs