With a Master of Science in Dietetics and Exercise Science, 11 years of experience in fitness, and 5 years in nutrition, Hollee Mohni is a professional dedicated to improving individuals' health and confidence through sustainable habits.
Does waist size increase with muscle? This is a question that someone who has recently started working out may find themselves asking. You may wonder about this after realizing that your ab and core workouts are not giving you the desired results.
After all, ab workouts should make your waistline smaller, right? If this describes you, you should know that you’re not alone. In fact, this is a common question and occurrence. Let’s take a look at if, how, and why muscle growth may make your waist bigger.
Unfortunately, yes it can. But how does this happen? It’s a common misconception that doing multiple abs and core exercises will burn or melt your fat away. However, this is not true.
While working out in general helps burn calories, targeted workouts such as ab exercises do not do this alone. Instead, they help build and grow already existing muscles.
While you may not see them, you already have ab/core muscles. They’re just not as pronounced as they’re hidden beneath a layer of fat. If you have a lower body fat percentage, the muscles aren’t as big and that’s why you can’t see them.
When you exercise your core, your muscles will start to grow under the already existing layer of fat. The growth of muscles, coupled with the fat in your body, may make your waistline bigger. The only way to get rid of this effect is not to stop working out, but to give attention to and change your eating habits while increasing your daily calorie burn from movement.
The oblique muscles are the biggest culprit when it comes to a bigger waistline due to muscle growth.
According to The Mayo Clinic, the core is made up of 29 pairs of muscles. These muscles are compacted in a ‘box’ that starts from the diaphragm all the way down to the pelvic floor and girdle of muscles around the hips (4). Of these 29 pairs, fitness is majorly concerned with 5 (or 6 depending on how you count them) major muscles, namely (3):
When it comes to ‘does waist size increase with muscle?’ the obliques are often the main culprit. Because of their location, when they get bigger due to exercise, they may make the waistline appear bulkier instead of narrow as many people want.
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Yes, it can. Some reasons why your waist may be getting bigger include:
Other factors such as hormonal imbalances, increased alcohol intake, and pregnancy can all lead to your waist getting bigger.
Some sources say that in order to reduce your waist size, it’s best to concentrate on working your ab muscles and your obliques. We say that a smaller waist is more about your body fat percentage rather than the core muscles themselves.
While bigger core muscles can make your jeans fit a little tighter around the waistline, the change is neither big nor drastic. The biggest culprit of a larger waist is fat. So, if you want a smaller waist, you should do exercises that help with calorie burning – which equates to fat burning – and you’ll see changes.
Research has shown that high-intensity intermittent exercise, high-intensity interval training, or simply high-intensity exercises are the best for losing belly fat (14, 6, 10). Examples include stationary cardio circuits, running/cycling circuits, and strength-based circuit training.
Strength training exercises such as squats, lunge jumps, push-ups, and pull-ups can also work as HIIT if they’re done at a faster pace. You can also do exercises that combine cardio and strength training such as burpees, mountain climbers, jumping jacks, and high knees to meet your goals.
These are much better at making the waist smaller than targeted core workouts.
How can I slim my waist? This is an issue that bothers many women who are working out and cannot seem to achieve their desired hourglass figure. It’s also an issue with men who want to have a trimmer waist.
The two main things you can do to keep your waist from getting bigger are:
1. Fix your diet – While an hourglass figure diet is not really a thing – this figure is more due to genetics than diet or exercise – there are some foods you can add to your diet that will help you get a trimmer figure and waistline.
These include fruits and vegetables, lean protein, whole grains, and healthy fats. It’s also important to mind your portions. Eating too much can lead to an increase in body weight and visceral fat, two things that contribute to the dreaded muffin top.
2. Avoid certain, but not all core exercises – Exercise in general is great for a trimmer waist. As explained, working out burns calories, which helps give you a leaner physique and a smaller waistline – both cardio and strength training are fantastic for this. However, some targeted core exercises can lead to increased muscle mass and make the waist bigger – specifically those that target the obliques.
Examples of such exercises you should avoid in order to stop and hopefully reverse this waist-thickening process include:
This exercise targets the love handles. The workout and the added weight will make the obliques larger, thereby increasing your waistline.
While regular crunches can be considered to be an okay option, adding weights to them is not advisable. This is because the extra weight forces your rectus abdominis – aka ‘six-pack’ abs – to work double time. Eventually, your six-pack will stand out more, increasing your waistline and making your waist look larger.
This workout is usually done using a kettlebell, dumbbell, medicine ball, or cable machine.
For anyone who wants to grow their obliques or side abs, they are a great addition to any routine. However, if you desire an hourglass figure or even just a smaller waist in general, then it may be best to avoid them. The best core exercises for a slim waist are isometric exercises such as planks, side planks, and hollow body holds.
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Thankfully, some workouts are known to be more effective than others in slimming the waist. Some fantastic examples of workouts that are great for your core without the undesired effect of making your waist bigger include (17):
This alternative is a more advanced version to the lying leg raise. This exercise is also fantastic for increasing grip strength.
Please note that you should consult your doctor before you attempt any of the above exercises. This is even more important when it comes to people with chronic or unstable health conditions, asthma, or any other respiratory ailment, high blood pressure, osteoporosis, or diabetes (5).
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Yes, it can. However, other causes are more likely than your core exercises. Some culprits of a bigger waist while exercising are:
As previously stated, core exercises don’t miraculously melt or burn fat. When you do core exercises, you build and grow the muscles that are hiding under the fat and this may temporarily make your waist bigger.
However, if you lose this top layer of fat, your waist will be smaller despite the muscle growth. Remember while it may weigh the same as fat, muscle occupies a much smaller space.
Making healthier food choices and watching your portions and calorie intake (19) will go further toward fat loss than working out. It doesn’t matter whether you do a combination of sit-ups, crunches, planks, and other core workouts on a daily basis. If you eat more calories than you burn, your waist will grow despite your intense ab workout routine.
A lot can be fixed regarding calorie intake and extra fat. To curb the stomach bulge, you should:
Eating an excessive amount of calories from healthy meal options is also detrimental to your waist size. Take note of your usual calorie intake and cut it by at least 500 calories. A caloric deficit is essential for cutting down on body and stomach fat.
3. Replace sugary beverages – Energy drinks, sodas, and pre-packaged fruit juices are not the best for you and your waistline as they’re full of added sugar. Instead of purchasing these, opt for water. You can even infuse it with a bit of fresh fruit to give it some added flavor.
4. Workout – Not just ab and core workouts. Incorporate full-body workouts such as cardio and HIIT training that will make you sweat and burn more calories. You require at least 30 minutes of exercise five days a week. Simple examples include walking, jogging, taking part in a dance or Zumba class, joining a circuit training class, or doing strength training (18).
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Yes, waist size can increase due to weight lifting. Strength training breaks muscle fibers that then grow bigger and stronger after rest and an adequate intake of protein.
Building your core muscles will make these muscles more pronounced and slightly increase your waist size. However, this isn’t typically very noticeable and can be easily fixed by reducing your body fat percentage. You get to keep the abs and reduce an extra inch off the waistline.
Due to the location of the obliques (the ‘love handle’ area of the midsection), targeting them during exercise can cause them to grow, thereby making your waist bigger and broader. Please note that this doesn’t mean you should stop exercising your obliques.
These muscles are quite important to your overall core strength, and you’re advised to keep them in tip-top shape. It should be clear that it’s best to choose to avoid weights when working on your love handles (3).
Yes, it is. Two studies from 1998 and 1999 showed that aside from lifestyle and environmental factors, waist size is also highly influenced by your genes (9, 8).
This could explain why despite doing all the core workouts, some people can’t get an hourglass figure and some people tend to hold their weight in their stomach more than others.
No, they don’t. Squats are largely a lower-body workout that targets your gluteus, quadriceps, hamstrings, adductor, hip flexors, and calves. Doing squats constantly will make these muscles bigger.
Fun fact: squats also target the core muscles – specifically the rectus abdominis and erector spinae, albeit not directly. This helps increase core strength, which helps with balance.
For the average person to lose an inch from around their waist, they should look to lose approximately 4 lbs (1.8 kgs) from their weight (11).
Yes, they can. Research has shown that mini/micro workouts can build muscle, improve your health, and prevent long-term sickness (13, 7, 12)
Yes, it can. Core workouts build bigger muscles, which can increase the size of your waistline. However, this shouldn’t deter you from exercising. It’s a temporary and fixable situation that’ll go away if you eat the right foods and choose the right workouts.
You should also keep in mind that weights are not your enemy. While weighted oblique workouts can have some undesirable effects, they’re still quite important for strengthening and improving balance. Use lighter weights for this area or stick to doing body weight exercises if you’re worried.
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