This simple exercise can be a game-changer for your core strength and your low back.
By Kelan Ern Updated: 04/26/26
I love dead bugs.
I've personally seen this insect-inspired exercise help countless people rebuild their core strength and help bulletproof their low back. It's arguably one of the best core exercises - ranking up there with planks, side planks and birddogs.
They may look simple.
But they are an exceptional way to train your core without cranking out thousands of sit-ups or becoming ‘King Crunches’ at the gym.
Plus, when done correctly they can help protect the spine and keep it healthy.
What Is The Dead Bug Exercise?
As the name suggests, dead bugs involves lying on your back with your arms and legs in the air – like a recently deceased bug.
This position helps support your spine so your core can fire -while minimizing other muscles from taking over. Then depending on the variation, you alternate extending the arms and legs.
Whether walking, sprinting, or crawling on the ground - your core stabilizes you the same way as you move your opposite arm and leg. This exercise simply trains that same movement pattern at a more fundamental level.
How to Do Dead Bugs Correctly
Dead bugs are one of the most common core exercises found in physical therapy and fitness programs but the devil is in the details. Here's how to really break them down and do them correctly. That way you can get the most out of this core exercise.
We'll start with the most common one: the half-dead bug.
Or half-alive, if you're more of an optimist ;)
Starting Position: Lay on your back with your knees bent. Raise both legs to roughly 90 degrees and then reach both arms towards the ceiling. Your lower back will have a slight curvature (it doesn’t need to be flat against the ground)
Execution: From this position, keeping your lower back stable, extend your right leg and left arm at the same time and then return to the starting position. Repeat 10 reps. Then switch sides and do left leg and right arm.
Four Common Dead Bug Mistakes
Despite the simplicity of dead bugs, there are some common mistakes that people make with this exercise. Some of these nuances I missed for years. I see these slip past even experienced personal trainers and fitness professionals.
Several years ago, my girlfriend (now wife) went to a high-powered yoga class where the instructor asked, “You know why it’s called a dead bug?”
The class shook their head.
“Because you imagine smashing a bug under your low back”
When she told me this, I shook my head in disappointment. You don’t want to excessively arch the low back, but you don’t have to smash the ground either as you'll see in a moment.
Mistake #1: Arching the low back Avoid excessively arching the lower back and flaring the ribs up. You want a natural curvature which is slight curvature of the spine.
Mistake #2: Flattening the low back Avoid going to the other extreme where your back is flat against the ground. The spine has the most integrity when it has slight curvature. If someone can’t slide a hand underneath your low back then you are flattening the spine too much.
Mistake #3: Pulling the foot This is where you pull your feet up towards your head (ankle dorsiflexion). This compensation tends to recruit thigh muscles which can reinforce core dysfunction
Mistake #4: Hip Rotation This is another subtle compensation where the stabilizing leg will externally rotate. This is also not ideal because it means you are using hip muscles to stabilize, not the core. If your foot keeps wanting to drift in, you are rotating from the hips. Keep the foot and knee inline.
5 Beginner Variations of Dead Bugs
Sometimes the half-dead bug is too challenging for the core or the spine struggles to stay stable. If that’s the case, these are my favorite regressions for building up to them. That way when you return to dead bugs, you’ll be that much stronger. Each variation gets progressively easier and gives you more stability.
Reaching Dead Bugs
In dead bug position, you reach your hands straight towards the ceiling. Then reach higher. Then you extend one leg and return. Note: This is not just about keeping your arms straight. This is reaching with your shoulder blades too which recruiting important shoulder muscles.
Leg-Locked Dead Bugs
Credit to this exercise goes to physical therapist Gray Cook and his team at FMS. This is where you hug one knee to your chest during the exercise. This helps keep the low back from arching and keeps your pelvis stable. This extra stability can make a huge difference.
Quarter Dead Bugs
Hold the starting position, then simply extend your right arm, return. Then left arm. Then right leg. Then left leg. This variation helps you breakdown and identify which limb is most difficult for you to stabilize.
Dead Bug Set-Ups
This is simply getting into and out of the dead bug position - while keeping core control. Start with your knees bent and feet on the ground. Then simply raise one leg up. Then the other. Then lower one, then the other. Do five leading with the right leg and then five leading with the left leg.
Dead Bug Marches
This variation is breaking down the movement even more. Start in the same position as the last variation. Then simply raise one leg up, pause, then lower that same leg. Do ten on the right and then ten on the left.
What If My Back Hurts During Dead Bugs?
Some people have low back discomfort during dead bugs. Whether it's low back tightness or pain - there are three main strategies that can be helpful. Some people believe this is a sign that the low back is weak. This is not the case. This is the spine losing stability or the low back muscles taking over the exercise.
Shorten the Range of Motion Instead of reaching out as far you can with the leg, only extend as far as you can keep the low back stability. If your low back is tightening during, you might be losing core control. Shortening the lever is one way to adjust that.
Shorten the Reps Some people are able to do this exercise for a certain number of reps before their core muscles tire and then their low back kicks in. If that’s the case, do less reps with short breaks in between and see if that helps.
Inhale/exhale Breath is one of my favorite ways that can make a huge difference in this exercise. For some people exhaling as they reach the leg out, helps keep their low back from arching. Other people find an inhale as they reach the leg, helps them stabilize better.
If these strategies don’t give you relief, recruit a movement professional or physical therapist to help give you more answers.
5 Advanced Dead Bug Variations
If the regressions are a piece of angel-food cake along with half-dead bug then you can move onto these advanced variations. Each one of these challenges your core from a different angle and has slight adjustments to fire up more core muscles.
Same Side Dead Bugs
With same side dead bugs, you extend the same arm and same leg. This is not challenging the core the same way – instead it’s putting the emphasis on your core’s ability to resist extension (aka arching the back).
Weighted Dead Bugs
This is very similar to the reaching dead bugs except that you are holding a plate or light kettlebell while you are extending one leg at a time. Remember: reach as high as you can to the ceiling. Don’t just keep your arms straight.
Full Dead Bug
In this variation, extend both arms and both legs at the same time. Then return to the starting position. Try to keep the spine from excessively arching. This will challenge your core’s ability to resist spinal extension in a big way.
Wall Dead Bug
Wall dead bug is an awesome variation from strength coach Mike Robertson. This time you press your arms into a wall behind you as you do the exercise. This pressing is another way of recruiting more core muscles to the exercise. Remember: Avoid arching the low back.
Incline Dead Bug
This is an original variation that is similar to weighted dead bugs except you are holding a 10lb sandbag at a 15-20 degree angle while doing the exercise. Feel how this slight inclines activates your core without even thinking about it.
4 Benefits of The Dead Bug Exercise
The four biggest benefits of the dead bug exercise is it helps reinforce proper posture, strengthen deep core muscles, build spinal stability and rotary stability. Here's how this powerful exercise does it.
Reinforces Proper Posture
One overlooked benefit of the dead bug is simply the starting position. During exercises like sit-ups, crunches and side plank – it’s easy to jut your head forward. This reinforces the ‘tech neck’ most people already struggle with.
However, with dead bugs, the ground helps support you and reset proper neck and spinal position – while you strengthen the core. This spinal alignment also helps the right core muscles to fire during the exercise.
Strengthens Deep Core Muscles
Many core exercises like sit-ups and crunches target mostly the abdominals, while dead bugs hit deeper, more important core muscles such as:
Lower abdominals
TVA (transverse abdominus, an important deep core muscle that stabilizes the spine)
External obliques (which run on the outside of your midsection). These are especially important to help control the pelvis and can help control low back pain caused by arching at the lumbar spine.
Builds Spinal Stability Dead bugs test how well your spine stabilizes while your arms or legs move.
Whether it’s running on the treadmill, shoveling snow (without straining your back), or pushing a lawn mower – everyday life requires this kind of core stability. During the exercise, the ground provides you with feedback and boosts your awareness of when you arch your back. If you have a tendency of arching your low back while standing, it will show up here. And this exercise will help you develop more awareness and core control to prevent it. Builds Rotary Stability
This is your body’s ability to resist rotation. The average gym-goer doesn’t train the core this way, let alone knows it exists! Think about carrying a suitcase with one hand while climbing stairs. Rotary stability prevents you from caving over.
It also shows up when you grab a backpack in the passenger seat... climb out the car without twisting awkwardly… or while crawling on your hands and knees (which is one way we developed this core strength as babies). It’s vital for daily movement and pain-free movement.
Which Dead Bug Should You Start With?
Back when I started personal training in college, I worked with college professors, students and people in the community. Whether it was one-on-one, semi-private or group workouts I started most clients with half-dead bugs and a heck of a lot of tough plank variations. Today I start most people on dead bug set-ups. The reason: most people struggle with keeping their spine stable (without arching) during core exercises. This has been one of the best places to start.
If you crush it, congratulations and get ready to explore the next variations. If you find it challenging, keep working at it.
Building your core stability is not something to rush.
It’s something to nurture.
That way you aren’t just tiring out your midsection, you are building greater core stability when you squat, lunge, run or any other physical activity. The kind that supports you when you need it, not just in the gym. The kind that keeps your low back healthy, expands your physical freedom and allows you to keep participating in meaningful hobbies.
Kelan Ern Elite Fitness Coaching
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