EstimatedEst. Read Time: 15 minutes
How To Do Crunches The Right Way


Crunches are one of the most popular beginner core exercises, especially if your goal is to burn belly fat and build that much-desired six pack.

But here’s the thing, guys:

Crunches might be one of the most popular abdominal exercises, but they are also the one beginner exercise that is usually performed incorrectly.  I don’t want this to be you!

Today, I want to discuss the top 10 most common abdominal crunch mistakes and exercise tips on how to fix them.

Guys, I guarantee you’re making at least ONE of these mistakes for this abdominal exercise so let’s make sure we fix that today so you can bring this information to your workouts this week.

Crunches might be one of the most popular abdominal exercises, but they are also the one beginner exercise that is usually performed incorrectly.

Let’s jump into the best ways to do abdominal crunches, but first, we’ll need to cover the anatomy of the abdominals.

abdominal muscles obliques anatomy


The best way to maximize contraction of the abdominal muscles is by understanding the function of those core muscles in relation to which direction the muscle fibers move.

Now one thing you’ll immediately notice here is that the crunch is an isolation exercise, not a type of compound exercises.


The rectus abdominis muscle runs vertically straight up and down, and it’s targeted exclusively through flexion and extension exercises.

Play Button
rectus abdominis


 The obliques are angled muscles that run high to low and low to high. There are two sets of oblique muscles: the internal and external obliques. They help with rotating the torso laterally (sideways), as well as flexion and extension.

Play Button
internal obliques
Play Button
external obliques


One of the most neglected muscles of the abs, the serratus is intertwined with the external obliques. This means if you want to burn body fat and have six-pack abs, you’ll need to work both areas.

Play Button
serratus muscle of the chest


The transverse abdominis runs horizontally. You can think of the transverse abdominis as your own internal weight belt. It helps with rotating the torso and stabilizing your spine.

Play Button
transverse abdominis muscle


Now that you know exactly which muscles you need to target when performing a basic crunch, let’s jump into the top 10 most common mistakes with abdominal crunches.

As a trainer, these are the mistakes I see the most. I guarantee that you’re making at least one of these mistakes while performing this classic core exercise.

And here’s the thing, these mistakes aren’t connected to using weights during the crunch. Performing these with only body weight, you’ll still make the same mistakes. Using weights just makes the mistakes more extreme.


 Mistake number one might come as a surprise to some of you, especially if you already believe that standard crunches are terrible and useless core exercises.

That being said, I’m a big fan of this core-strengthening exercise, and there’s good reason that’s it a favorite exercise of mine.

Play Button
do you think crunches suck

I appreciate the researchers that have gone into great depth to show that they don’t believe that crunches are an effective or safe bodyweight exercise.

However, I don’t necessarily agree with the research itself.

When this type of research is being done, it’s usually performed on animals, not humans. What’s more, when humans are used, it’s usually cadavers that are the test subjects.

These cadavers are dried out and they aren’t responding the same way that a living, breathing human being would respond.

Throw in the fact that the accumulation of load is typically not represented in a way that we do it when we do crunches.

Lumbar flexion is one of the main functions of the abdominal muscles. It’s one of the most common daily movements in our repertoire, and we can do it safely without increasing our risk of injury.

When we are activating lumbar flexion during an exercise routine, we actually take a break during the movement and we decompress from time to time, which saves the health of our spines.

The bottom line here is that it’s too early to jump on the “crunches suck” bandwagon, especially when we know that there are benefits to be had.


Continuing with the point above: I’ll admit that people who say that crunches aren’t good are usually complaining about low back pain after doing them.

And I guarantee that more often than not, these same people are hooking their feet the wrong way during this basic exercise, which increases the risk of low back pain.

From the starting position on the floor, if you put your feet flat and under something to stabilize your body and pull up, all you’re doing is over activating your hip flexors.

And this can actually create low back pain because of their attachment on the lumbar spine.

Play Button
hooking your feet

However, if you make the simple adjustment of putting your feet over the top of something to anchor your body, this gets you that all important activation of the hamstrings, letting the hip flexors relax and taking that excess strain off of your lower back.

Play Button
anchor your feet over something for the abdominal crunch

It’s a simple switch, but it’s a big one when it comes to leaving you with only the gains and none of the pains that you get from crunches.


Speaking of pains, what happens when you pull on your neck during crunches?

You’ll walk away with neck pain and potential neck injuries.

Play Button
pulling on your neck in crunches

If there’s one thing I’ve seen in the gym more than anything else, it’s this:

People hook their hands behind their head, and they pull on their neck first, focusing only on moving their heads.

You’re focusing on the wrong point here, guys. You’ve got to focus on your core and shoulder blades.

The first step is to make sure that you’re clearing the bottom of your shoulder blades off the ground on every repetition WITHOUT straining your neck.

From the starting position, keep the neck neutral and relaxed. Don’t forget to have your shoulders relaxed and in a neutral position as well.

Also, try not to have the elbows pointing forward in a contracted state. Instead, let your elbows be more relaxed and off to the side.

Play Button
clear shoulder blades off the ground in crunches

This means you need to keep your neck straight and focus on the contraction of the abs – not just the lifting of the upper body, which is the perfect segue into the next abdominal crunches mistake.


When it comes to the most important part about doing a crunch, most of us worry about the wrong thing: getting to a fully seated position.

But most of us don’t necessarily worry about how we’re getting there.

Getting from Point A to Point B isn’t the important part; it’s the journey that got you there and the quality of the rep.

Now, there’s nothing wrong with a fully executed sit up, IF done properly.

But I’m saying when people are doing their crunches, they should stop focusing on the height that they get with their upper body and focus more on the quality and control of the contraction.

Play Button
focus on quality of contraction in crunches

It doesn’t matter if you slow down your pace. It doesn’t matter if you can’t do as many.

The key is that you want to make sure that you have perfect form, your abs are initiating the contraction, and that same muscle is controlling it all the way up and all the way down.

The eccentric lowering on a crunch is just as important as the way up, but both of them matter.

And this will only happen if you’re focusing on the contraction of the abs alone and not just how high or how low you’re getting.


This next one can be confusing for a lot of people, but you have to make sure you get this right, so pay close attention here.

Guys, if you want your abs to look their best from the different types of crunches that you’re doing, you need to master the proper form technique of blowing air OUT while contracting your abs IN.

I know that seems like a contradiction but hear me out.

If you focus on just breathing air out AND puffing your stomach out, you’ll build up a bulging belly, even if it has a six pack over the top, rather than that flat type of belly that you’re looking for.

Now we all have been told that you want to breathe out on the exertion part during bouts of exercise, but it doesn’t mean you want to push out while you’re doing a standard crunch.

What I mean is you don’t want to distend your belly and push out as you’re coming up into a crunch.

Play Button
distending your belly during crunches

As a matter of fact, you want to try to pull down or cinch the stomach down as you breathe out.

And the way to do this with some good feedback is to just place something like an exercise ball, tennis ball, or an object on your belly button.

Lie down on an exercise mat and focus on first pulling your belly down, contracting the transverse abdominis and then initiating the crunch and not allowing that belly of yours to push out and have that object fall off.

Play Button

Distending and pushing out is not the same as breathing out.

You want to make sure that you can breathe out while pulling in to get the right breathing pattern.

Ultimately this will help you get the core strength and the aesthetics you’re looking for when you’re trying to carve out your six pack.


If your idea of crunches is to come up two or three inches off the ground and simply pump away, you’re making the next mistake on our list.

Play Button
focus on quality, not counting reps in crunches

When you’re doing this, you’re not worried about the quality of your reps.

This focus on the numbers isn’t going to help you see those sculpted abs you’re looking for.

I say it all the time: STOP counting reps and instead make your reps count.

When it comes to crunches, you want to make sure that every single rep is executed properly.

The only way you’re going to do that – the safer version of this exercise – is by forgetting about how high you can count to.

Instead, focus on how well you perform the contraction – how much you can make it hurt – on every single rep you do.


Our next mistake relates to what you’re seeing when you do your crunches. What I’m talking about is your view.

You need to change your view every once in a while. In other words, you need variation.

Don’t always do crunches face up. Make sure you do your crunches in other positions.

You see, people usually overlook the fact that crunches are crunches, whether or not you’re lying face up (bicycle crunches) or face down (mountain climbers).

Play Button
perform other types of crunches besides lying

Lumbar flexion is the main driver of abdominal activation through a crunch, and we can do that so many other ways besides a traditional crunch, mountain climber, or bicycle crunch exercise.

Closed-chain crunch variations are great because they give you a more seamless flow through the kinetic chain to allow these ground reaction forces to pass up and down through our entire body, transmitting right through the entire core.

Lumbar flexion is the main driver of abdominal activation through a crunch, and we can do that so many other ways besides a traditional crunch, mountain climber, or bicycle crunch exercise.

If you remember one thing from this list, it’s this:

Make sure you’re mixing it up because if you always do the same thing, you’re going to keep getting the same thing you’ve always gotten.


Now that being said, I have my issues with certain crunches done in an alternative position. In this case, I’m talking about the cable crunch pulldown.

This is not the way you do it.

Play Button
performing crunch pulldowns incorrectly

A lot of people do this exercise and focus on the hip flexion motion, not lumbar flexion.

They simply sit back onto their heels and let that do all the work for them.

If you want this exercise to work for you, you have to learn how to keep your butt in the right position, and that means the same position you started in.

Play Button
butt in correct position for crunch pulldowns

From here, you just want to simply pull your elbows down towards the ground using just the flexion of your lumbar spine and not the sitting back of your pelvis onto your heels.

I can’t stress this enough: focus on the quality of the contraction, the quality of how you perform the exercise, and forget about the numbers.


Continuing with the same idea from above, I want to talk about a version of the crunch that most people completely forget to do: the side crunch.

This is another one of the most popular core exercises in terms of effectiveness, but I rarely see guys doing it.

When you’re performing the side crunch, you want to make sure of two things:

First, you shouldn’t be pulling on your neck.

Secondly, and more importantly, you should be focusing on that really high-quality contraction.

The side crunch is my go-to exercise and the one most responsible for the oblique development that I have, because I do this with serious intent.

Play Button
side crunches

Every single time I lift off the ground, I’m not yanking on my neck, I’m focusing on getting my elbow closer to my hip, but initiating through and only through the oblique muscles on my side.

Try to put your mind right where that muscle is and think about it as if you’re the muscle itself going through that contraction. Return to the starting position and do it all again.

Do this and I promise you, you’re going to get way more out of this exercise.

The development that you’ll see here will be much quicker because you’re doing it the right way.


And that brings me to mistake number 10 and that is, instead of taking advantage of other popular abs exercises – you’re only doing crunches.

I like crunches –  they’re part of an important ab training program. However, if you’re only doing crunches, even if you’re doing them from alternative positions, you’re not training your abs fully.

The functions of the abs are many. In some cases, their job is to prevent you from moving at all, preventing extension, rotation, and side bending.

With that said, you want to make sure that you’re doing alternative exercises such as side twists, woodchopper, and anti-rotation exercises. These are also great for burning belly fat.

And there you have it, guys.

The top 10 abdominal crunch mistakes. Make these easy fixes so you can enjoy one of the most effective abs exercises.

How many of these mistakes will you make a conscious effort to change starting today?

If you’re looking for a training program that takes all the details into account and leaves no stone unturned, check out our ATHLEAN-X programs and see which one best fits your goals and available equipment.

Program Selector ==> See which program best fits your goals
AX1 ==> Train at Home With Dumbbells and Minimal Equipment
XERO ==> Train at Home With No Equipment


  1. The first abdominal crunch mistake is the belief that doing crunches is bad for your back. I simply don’t agree with all of the studies that claim this. These studies are using animals or cadavers. In reality, we can allow plenty of time to recuperate while avoiding extreme numbers of crunches.
  2. That is not to say that crunches can’t cause low back pain, because they absolutely can if you’re making our next mistake. Hooking your feet under something when performing your crunches can cause low back pain because of over activation of the hip flexors. It’s an easy fix: hook your feet either over something or not at all.
  3. Pulling on the neck can cause pain. Gently place your hands across your chest or behind your head but do not interlace your fingers. Look up toward the ceiling as you let your abs do all of the work.
  4. Stop worrying about how high you lift off the ground with every rep. Focus on clearing the shoulder blades off the mat when doing crunches, as this is enough to get full activation of the abs.
  5. Learn how to breathe out while not distending the abdomen during a well-executed crunch. With the contraction of the transverse abdominis, you will be able to cinch the belly down while exhaling, which will engage the abs but not lead to a protruding belly in the long run.
  6. When it comes to the reps you perform in your ab workouts and other effective ab exercises, stop counting them. Instead, make every one count.
  7. Lumbar flexion can be achieved from many other positions so stop limiting yourself to crunches on your back. Make sure to include some of the closed-chain options.
  8. The crunch pulldown is usually performed incorrectly. Here’s an easy fix. Instead of sitting your butt back onto your heels on every rep, make sure to keep your butt in the same position that you start in. Crunch only by flexing the spine and getting your elbows down to the floor.
  9. One of the biggest ab workout mistakes is not doing side crunches. They are great for isolating the obliques and getting a solid contraction of these important waist tapering muscles.
  10. Finally, only doing crunches in your ab workouts is not the answer either. Be sure to train the other functions of the ab muscles including anti-rotation, anti-flexion, and anti-lateral movements.

Watch the YouTube version of this article
Popular & Trending
stop doing face pulls like this facepull mistake
How To Do Face Pulls
By Jeff Cavaliere MSPT, CSCS
September 9th, 2019
Face pulls are one of the best corrective exercises to help offset poor posture and shoulder dysfunction.  They help strengthen the chronically weak...
how to identify your body fat percentage with images for men
Body Fat Percentage Men
By Jeff Cavaliere MSPT, CSCS
May 1st, 2013
There are many ways to measure body fat percentage; some wildly expensive and most inaccurate. It's time to give you an alternative method that...
2 reasons your biceps aren't growing and 3 ways to fix it
Why Your Biceps Aren’t Growing
By Jeff Cavaliere MSPT, CSCS
August 22nd, 2019
Have you ever felt that no matter how much you trained your biceps you’re left saying… “My Biceps STILL Aren’t Growing?” I believe I know...
The PERFECT Abs Workout
The PERFECT Abs Workout
By Jeff Cavaliere MSPT, CSCS
July 31st, 2019
We’ll be following my ‘Six Pack Progression’ sequence as we choose each of the beginner and advanced ab exercises for each abdominal movement...
incline bench press avoid mistakes for upper chest
How To Incline Bench Press Correctly
By Jeff Cavaliere MSPT, CSCS
June 21st, 2019
The Incline Bench Press is one of the best upper chest exercises there is, but there's one major problem preventing us from getting the maximum...
best dumbbell exercises for chest
The BEST Dumbbell Exercises for CHEST
By Jeff Cavaliere MSPT, CSCS
October 9th, 2019
Today I’m going to share my favorite chest exercises… but there’s a catch. We can only use dumbbells! I’ll show you what to do whether you...
how to construct a complete chest workout
The PERFECT Chest Workout
By Jeff Cavaliere MSPT, CSCS
July 25th, 2019
The classic theory of "Upper, Middle, and Lower" chest exercises is a good start, but, it's not enough!! The solution to this problem is to not...
best dumbbell exercises for shoulders
BEST Dumbbell Exercises for SHOULDERS
By Jeff Cavaliere MSPT, CSCS
October 5th, 2019
You want to build big shoulders and you only have access to a few pairs of dumbbells. What do you do? I’m going to show you what to do whether...
how to construct a complete biceps workout
The PERFECT Biceps Workout
By Jeff Cavaliere MSPT, CSCS
July 15th, 2019
The classic theories of “just do curls” or “it’s not necessary to train your biceps directly” are both flat out wrong! Why? Because it’s...
Home Chest Exercises UPPER, MID, LOWER CHEST!!
Chest Exercises at Home
By Jeff Cavaliere MSPT, CSCS
May 27th, 2021
Being able to effectively hit your upper, mid and lower chest from home with NO equipment may seem impossible. But, I’m here to show you it’s...