Deep Core Exercises for a Stronger Waistline and More Athletic Body After 40

Today, we’re covering deep core exercises to rebuild core strength.

If you’re over 40, have had kids, and you feel like your midsection is not doing its job anymore, you’re not imagining it.

I’ve had a weak core for as long as I can remember. It showed up in all the classic ways: my hip flexors took over everything, I struggled to really “find” my glutes, and yes, I sometimes peed a little when running. It started after kids, but aging (and the stress we carry in our bodies) didn’t help.

Here’s what surprised me most: I even had a tummy tuck. Everything looked tighter, but functionally, my core still felt weak. That was my wake-up call that looking “flat” and having a strong, supportive core are not the same thing.

So let’s talk about what actually matters: deep core strength, how to tell if yours is underperforming, why it happens, how to engage it (without holding your breath), and a simple routine you can repeat.

Quick note: this is general fitness info, not medical advice. If you have pelvic pressure, heaviness, pain, or symptoms that are getting worse, pelvic floor physical therapy can be a really good next step.

Deep Core vs Abs: What’s the Difference?

Your “abs” (surface muscles)

• Rectus abdominis: the “six-pack” muscle, the one that flexes your spine (think crunching forward).
• Obliques: help rotate and bend your torso.

Your deep core (stability system)

This layer supports your trunk, pelvis, and spine. When people say “deep core,” they usually mean a system that includes:

• Transverse abdominis (TVA): the deepest ab muscle, helps stabilize your trunk and manage pressure.
• Diaphragm: your main breathing muscle, which works with the TVA for pressure control.
• Pelvic floor: supports pelvic organs and contributes to continence and stability.
• Deep back muscles: help stabilize your spine.

You can do ab exercises all day and still have a weak deep core. That’s often why people get low back tightness, hip flexor takeover, doming/coning, or pelvic floor symptoms when they return to running or heavier lifting.

Signs You Might Have a Weak Core

Here are signs I see constantly in women over 40, especially post-kids:

1) Your hip flexors take over during core work

If you feel dead bugs or hanging leg raises in your hip flexors more than your lower abs, that’s a sign your deep core isn’t coordinating well (yet). It’s common and fixable.

2) You get low back tightness during everyday life

Dishes, carrying laundry, long walks, and standing at the counter. When your deep core isn’t doing its job, your back often has to do extra work.

3) You “brace” by holding your breath

If you can’t breathe during an exercise, that’s not solid core engagement; it’s a pressure problem. Your abdominal wall needs to manage pressure, not trap it.

4) You see doming or coning down the midline

That ridge that pops up in the middle when you sit up, plank, or strain can be associated with diastasis recti or poor pressure management. Cleveland Clinic lists doming/coning as a symptom to watch for with diastasis recti.

5) You leak when you run, jump, sneeze, or laugh

This is super common postpartum and can also show up more with age. When I had a nasty cold and was coughing nonstop, it rudely reminded me fast that my core and pelvic floor still needed work.

However, this is very common postpartum and can also show up more with age.

6)Your balance has gotten worse

Your core helps you stay steady. If single-leg balance feels shaky or you can’t keep your torso stacked and tall, your deep core might not be supporting you well.

7) You have rib flare

Does your back sway a little, and do your ribs poke out? You might have a rib flare. It’s a super common symptom of a weak core: your low back overcompensates, and your ribs push forward, creating a flare.

Why Your Core Is Weak

It’s rarely one thing. It’s usually the stack of things and is very common with aging.

Pregnancy and postpartum changes

Pregnancy stretches the abdominal wall and alters how pressure is distributed throughout your trunk. Diastasis recti (ab separation) can be part of this picture and affect function, posture, and comfort.

C-sections and abdominal surgeries

Surgery can affect sensation and coordination. Even when everything heals well, you may still need retraining because strength is not just “tightness,” it’s timing and control.

Lifestyle factors

• Lots of sitting
• Shallow stress breathing (upper chest breathing)
• Jumping back into intense workouts without a stable base
• Chronic “sucking in” (it can mess with breathing mechanics)
• Not training the core directly

How to Engage Your Deep Core Muscles

Practice this before you move on to any deep core exercises. If you can’t feel the activation, the exercises will just turn into hip flexors and low back doing all the work.

Step 1: Stack ribs over the pelvis

Aim for a neutral-ish position:

• ribs not flared up
• pelvis not aggressively tucked
• think “tall torso” and ribs in line with the pelvis

Step 2: Breathe first

Put one hand on your ribcage, one on your lower belly. Take a slow breath in. Try to feel your ribcage expand 360 degrees, not just your chest. Then exhale slowly.

Step 3: On the exhale, gently tighten the deep core

This is subtle. You are not sucking your stomach in like you’re trying to zip jeans. Or, you’re lightly bracing like you’re about to be punched in the gut by a toddler.

Your abdominal muscles help stabilize your trunk and regulate pressure during things like breathing, coughing, and childbirth. That’s exactly what we’re training here

Quick self-checks

• You can still speak a short sentence (no breath-holding)
• No doming down the midline
• You feel lower abs working, not just hip flexors and neck

What deep core engagement should feel like

Pick 2–3 cues that click for you:

• Zipper: zip up low belly from pubic bone to belly button
• Corset: your waist gently narrows 360° (front + sides), not a hard suck-in
• Punch-ready (light): that “ready” feeling before a punch, but only 30–40%
• Support & lift: a subtle “hug in and up” under your belly button

Not this: ribs clamping down hard, glutes squeezing like crazy, neck tension, breath-holding, or doming.

Common mistakes to avoid:

• Holding your breath (pressure spikes instead of being managed)
• Ribs flaring (core can’t “wrap” well in that position)
• Over-tucking (flattening your back aggressively)
• Sucking in all day (tight isn’t the same as strong)
• Pushing belly out / doming (regress and rebuild control)

The Most Effective Deep Core Exercises

Deep core exercises are the fastest way to rebuild core strength after 40, especially if you’re postpartum or years postpartum. And good core strength helps with balance, posture, and protecting your back during daily movement.

1) Supine TVA brace (deep core activation)

What it trains: Transverse abdominis & pressure control
How to do it:

• Lie on your back, knees bent, feet on the floor
• Inhale (ribs expand)
• Exhale and gently “zip up” low belly (30–40% effort)
  Do: 5–8 reps of 3–5 second holds (keep breathing)
  Common mistake: breath-holding or smashing ribs down
  Make it easier: shorten the hold + reduce effort

2) Heel slides

What it trains: keeping your trunk steady while the leg moves
How to do it:

• Exhale, brace lightly
• Slide one heel away slowly (no rib flare, no doming)
• Slide back in with control
  Do: 6–8 per side
  Common mistake: hips rocking or low back arching
  Make it easier: smaller slide range

3) Dead bug

What it trains: deep core stability with limb movement
How to do it:

• Start braced (gentle)
• Tap one heel down, return
• Alternate, slow and controlled
  Do: 6–10 per side
  Common mistake: hip flexors taking over + ribs popping
  Make it easier: smaller taps or keep knees more bent

4) Bird dog

What it trains: cross-body stability (core + back support)
How to do it:

• Hands and knees, ribs stacked
• Exhale, brace lightly
• Reach opposite arm/leg long without rotating hips
  Do: 6–8 per side
  Common mistake: hips twisting or low back sagging
  Make it easier: move just the arm or just the leg

5) Glute bridge with exhale and brace

What it trains: deep core + glutes working together
How to do it:

• Exhale, brace gently
• Lift hips without over-arching your back
• Lower slowly
  Do: 8–12 reps
  Common mistake: rib flare + low back taking over
  Make it easier: reduce range or pause at the top for 1 second

6) Side plank

What it trains: side core strength for hip/back stability
How to do it:

• Set up with bottom knee down
• Brace gently and hold, breathe
  Do: 15–30 seconds per side
  Common mistake: shoulders creeping up to ears
  Make it easier: shorter holds or elevate your top hand for support

7) Bear plank (hover)

What it trains: deep core bracing + shoulder stability (anti-extension)
How to do it:

• Start on hands and knees, hands under shoulders, knees under hips
• Stack ribs over pelvis, tuck toes
• Exhale, gently “zip up” your core (30–40% effort)
• Lift knees 1–2 inches off the floor and hold while breathing
  Do: 10–20 seconds, 2–4 rounds
  Common mistake: holding your breath or letting low back arch / ribs flare
  Make it easier: hold for 5–10 seconds or keep knees down and practice the brace only

7) Suitcase (functional core)

What it trains: real-life bracing + posture + grip (core that carries over)

How to do it:

• Hold a heavy dumbbell/kettlebell at one side
• Stand tall: ribs stacked, shoulders down, neck relaxed
• Exhale, lightly brace (30–40%) like a gentle corset
• Walk slowly with control
• Turn around smoothly and keep breathing

Do: 3 rounds of 30–45 seconds
Common mistake: leaning to one side, ribs popping forward, rushing, breath-holding
Make it easier: lighter weights, shorter time (15–20 sec), walk slower

Alternative: Pallof press (functional core)

What it trains: anti-rotation + deep core stability (real-life bracing) How to do it:

• Set a band at chest height and stand sideways to the anchor point
• Step out until there’s tension, feet hip-width, knees soft
• Stack ribs over pelvis, exhale and lightly brace
• Press band straight out from your chest and don’t let your torso twist
• Pause 1–2 seconds, bring it back in slowly

Do: 2–3 sets of 8–12 per side
Common mistake: leaning, rib flare, shrugging shoulders, holding your breath
Make it easier: lighter band, stand closer to the anchor, smaller pause

A Simple Deep Core Exercise Routine You Can Do At Home

This is a deep core workout designed for women over 40, postpartum or years-postpartum, and anyone who feels weak, leaky, or “disconnected” in their core.

Remember: The best deep core exercises focus on control and coordination, not just “burning” your abs.

How often: 2–4x/week
When: after lifting or as a standalone routine

Warm-up (2 minutes)

1. 3 slow breaths, ribs stacked
2. TVA brace holds: 5 reps x 10-30 seconds

Circuit (2 to 3 rounds)

1. Heel slides: 6 to 8 per side
2. Dead bug heel taps: 6 to 10 per side
3. Bird dog: 6 to 8 per side
4. Glute bridge: 8 to 12 reps
5. Side plank (knee-down): 30 seconds per side or Bear plank: 30 seconds

Rest 30 to 60 seconds between rounds.

Optional finisher (if you have equipment);

• Suitcase carry: 3 rounds of 30 to 45 seconds
  OR
• Pallof press: 2 to 3 sets of 8 to 12 reps per side

How to Progress

Progressive overload is important for your core, too!

Progress in this order when you’re ready:

1. Always practice control and breathing first
2. More time under tension (slower reps, longer holds)
3. Bigger range of motion (e,g: extending legs a little further)
4. Longer lever (harder variations)
5. Load (weights, carries)

Regress if:

• you see doming/coning down the midline
• you can’t breathe and you’re holding your breath
• you feel downward pressure or heaviness (pelvic floor warning sign)
• your low back takes over

How To Know If The Deep Core Exercises Are Working

After years of training, I know that a strong core is not defined by how sore you get from ab work or the number of crunches you can do.

A strong core is:

• you can brace and still breathe
• your glutes can do glute work (instead of hip flexors doing everything)
• your back feels supported during lifting and daily life
• you can run or jump with better control (and ideally less leaking)

This matters even more over 40, especially if you lift heavy. Your spine and pelvis want stability. Your deep core is a big part of that support system.

When you practice deep core exercises consistently, everyday things like standing, lifting, and walking start to feel easier.

Core and Abs FAQ

Build This Into a Real Strength Plan

Deep core work helps, but it works better when it lives inside a real strength routine. The Fit Forever Method gives you a simple full-body training plan built for women over 40, so you can improve strength, posture, stability, and body composition without piecing it together yourself.