When most people think about their core, they’re thinking about the six-pack or perhaps the obliques. However, there’s a lot more to it than just your “abs”. Your deep core muscles are a group of muscles that sit deeper; while you can’t see them, they play a critical role in spinal stability, posture, breathing, and movement.
While you can’t completely isolate these muscles, you can improve how they function and strengthen them through proper bracing and well-chosen exercises. For most healthy people, standard core exercises like planks and bird-dogs provide all the deep core training you need.
Key Points You Need To Know!
Your deep core muscles consist of four muscles surrounding your core and spine, creating a “cylinder”.
When activated, these muscles contract to increase intra-abdominal pressure, increasing rigidity and protecting the spine.
Training your “deep core” muscles has become a trendy buzzword, but it is largely overstated.
Learning to brace your “deep core” is likely a more practical training goal than isolating them or following a specific workout.
The best exercises to train your deep core and improve stability are the barbell rollout, farmer carries, front carries, and Pallof press.
What Are Your Deep Core Muscles?
When most people think of their core, they picture the visible “six-pack” muscles. However, beneath the superficial abdominal muscles lies a deeper system designed for stability rather than movement.
Your deep core consists of four primary muscles that work together to stabilize your spine and pelvis:
1. Transverse Abdominis (TVA)
The transverse abdominis is the deepest abdominal muscle. Rather than running vertically like your six-pack, it wraps horizontally around your torso like a wide belt.
When it contracts, it narrows your waist and increases pressure inside your abdomen. This creates support for your spine during lifting, walking, running, and everyday movement.
It’s why your TVA is often referred to as your body’s natural corset, as it functions in a very similar manner.
2. Multifidus
The multifidus is a group of relatively small muscles running along both sides of your spine. However, they perform one of the most important jobs in your body.
Rather than producing large movements, the multifidus stabilizes each vertebra individually.
This helps to keep your spine aligned while you bend, twist, or lift. They’re sometimes compared to guide wires that keep a tall radio tower stable.
3. Diaphragm
The diaphragm is the primary muscle used for breathing, but it also forms the roof of your deep core. Every breath you take changes the pressure inside your abdomen. This allows the diaphragm to work alongside the TVA, multifidus, and pelvic floor to create stability.
This is why breathing technique is so important during heavy lifting.
4. Pelvic Floor
While the diaphragm sits at the top, the pelvic floor forms the bottom of the deep core “cylinder”.
These muscles support your bladder, bowel, and reproductive organs. Regulate intra-abdominal pressure.
During strenuous activity like lifting and running, the pelvic floor works automatically with the rest of the deep core to support your spine.
The Deep Core: A Complete Stabilizing System
As you may have noticed, the deep core functions as a single coordinated unit. Together, they form a cylindrical support system that wraps around your trunk.
The diaphragm forms the top
The pelvic floor forms the bottom
The transverse abdominis wraps around the sides
The multifidus reinforces the back
When contracted, they increase intra-abdominal pressure, creating a solid frame that protects your spine. It also allows force to transfer efficiently between your upper and lower body.
Why Are Your Deep Core Muscles Important?
The deep core muscles function to produce stability and rigidity rather than movement. When you perform strenuous activity, these muscles activate to protect your spine and allow power transfer.
A strong, well-coordinated deep core can help:
Improve spinal stability
Support better posture
Reduce unnecessary stress on the lower back
Improve balance and coordination
Transfer force more efficiently during lifting and sports
Support breathing mechanics during exercise
Maintain pelvic stability during movement.
The deep core is also commonly targeted during rehabilitation following pregnancy, surgery, or episodes of chronic low back pain. These circumstances can cause dysfunction within the system and can reduce spinal stability and movement efficiency.
That said, it’s important not to overstate their role. Or, more specifically, overstate the need for targeted workouts.
Many fitness trends make it seem like everyone needs specialized deep-core workouts. In reality, if you’re healthy, active, and regularly performing resistance training, you’re already training these muscles every session.
We’ve written about this before; what we think is one of the best core exercises, the barbell rollout (Escamilla et al., 2010). However, it wasn’t written in the context of training your “deep core” but rather improving your stability.
Do You Need To Target Your Deep Core Muscles?
“Train your deep core muscles” is trending right now, but it’s largely overstated. Certain wording suggests you won’t train them unless they’re targeted with special exercises.
The reality is they’re designed to work automatically, and you can’t isolate them. Physical therapists may teach specific activation drills during rehabilitation, but this is really only needed in persons with some form of dysfunction.
For the majority of people, all they need are exercises that demand stability and resist movement. This can be larger exercises, such as:
Rack Pulls
Front carries
Farmer’s carries
Back/Front squats
Barbell rollouts.
Other smaller, rehab-type exercises include:
Planks
Pallof press
Bird-dogs
Even resistance exercises like the renegade row require anti-rotation while you’re performing upper body exercises.
Research consistently shows that core exercises that require stabilization effectively recruit the deep stabilizing muscles while simultaneously strengthening the rest of your core.
For most people, that’s exactly what you want.
How to Brace Your Deep Core Muscles
While spending time targeting your deep core muscles may be more marketing than practicality, learning how to brace properly does have real benefits. Proper bracing can enhance the protective capabilities of these muscles.
This is important for everyone: the general population, the elderly, and advanced lifters.
Step 1: Inhale Into Your Belly and Ribs
Take a slow breath through your nose. Instead of lifting your chest, allow your belly and lower ribs to expand in every direction, including your sides and back. Imagine filling a balloon around your entire midsection.
Step 2: Gently Brace
As you begin to exhale, lightly tighten your abdominal wall as though preparing for someone to poke your stomach. Rather than forcefully sucking in, think about gently tightening a corset around your waist.
At the same time, lightly engage your pelvic floor. The contraction should feel supportive, not maximal.
Step 3: Maintain During Movement
Once you’ve established this brace, maintain it while performing the movement. You should also learn to breathe while maintaining the brace.
This creates intra-abdominal pressure, allowing the deep core muscles to work together as a single stabilizing system. With practice, this becomes automatic and more effective.
For a deeper breakdown, check out our dedicated page on teaching you how to brace!
The Valsalva Maneuver and Deep Core Muscles
In the Strength World, you may have heard of the “Valsalva Maneuver”. “Deep core bracing” is essentially the same thing, just packaged differently.
“Deep core activation” content is bracingly described in the gentlest possible way.
“Valsalva Maneuver” is associated with powerlifting and heavy barbell lifts.
The major difference lies in degree and strategy: the Valsalva maneuver is used to protect the spine during very heavy barbell movements. It’s a much more aggressive pressure strategy that involves a closed glottis and a breath hold (Chow et al., 2013).
However, the bracing mechanism is essentially the same.
The Bottom Line: Training Your Deep Core Muscles
Your deep core muscles are essential for spinal stability, posture, breathing, and efficient movement. Rather than functioning independently, the transverse abdominis, multifidus, diaphragm, and pelvic floor work together as a single support system that stabilizes your trunk during everyday activities and exercise.
Despite the growing popularity of “deep core” workouts, most healthy people don’t need to isolate these muscles. Standard resistance training and foundational core exercises like planks, bird-dogs, carries, and squats already recruit them effectively. The most valuable skill isn’t learning to isolate your deep core, but learning to brace properly so these.
FAQ
What is the best exercise for deep core muscles?
The best exercises for deep core muscles include planks, bird-dogs, dead bugs, Pallof presses, and loaded carries. These exercises require your transverse abdominis, multifidus, diaphragm, and pelvic floor to work together to stabilize your spine and pelvis.
How do you activate your deep core muscles?
To activate your deep core, take a deep breath into your abdomen and ribs, then gently brace your midsection as if preparing to be hit in the stomach. Maintain this tension while continuing to breathe and performing the exercise.
Can you train your deep core every day?
You can perform light deep core activation and bracing exercises every day, but harder core training still requires adequate recovery. For most people, training the core two to four times per week as part of a complete resistance training program is sufficient.
How do you know if your deep core is weak?
Possible signs of poor core strength or control include difficulty maintaining a neutral spine, excessive torso movement during exercise, poor balance, and an inability to maintain a brace. Back pain or pelvic floor symptoms can have many causes and should not automatically be blamed on a “weak deep core.”
Do planks strengthen your deep core muscles?
Yes, planks strengthen the deep core by requiring your trunk muscles to work together to resist spinal movement. The transverse abdominis, multifidus, diaphragm, and other core muscles contribute to maintaining a stable trunk throughout the exercise.
References
Chow, C.-M., & Hackett, D. (2013). The Valsalva Maneuver: Its Effect on Intra-abdominal Pressure and Safety Issues During Resistance Exercise. Journal of Strength & Conditioning Research, 27(8), 2338–2345. https://doi.org/10.1519/JSC.0b013e31827de07d
Escamilla RF, Lewis C, Bell D, et al. Core muscle activation during Swiss ball and traditional abdominal exercises. J Orthop Sports Phys Ther. 2010;40(5):265-276. doi:10.2519/jospt.2010.3073 https://pubmed.ncbi.nlm.nih.gov/20436242/
Rafael F Escamilla, Eric Babb, Ryan DeWitt, Patrick Jew, Peter Kelleher, Toni Burnham, Juliann Busch, Kristen D’Anna, Ryan Mowbray, Rodney T Imamura, Electromyographic Analysis of Traditional and Nontraditional Abdominal Exercises: Implications for Rehabilitation and Training, Physical Therapy, Volume 86, Issue 5, 1 May 2006, Pages 656–671, https://doi.org/10.1093/ptj/86.5.656
