Postpartum Ab Exercises: Safe Core Workouts After Baby

Your core after pregnancy is not the same core you had before it. Nine months of stretching, shifting, and accommodating a growing baby, followed by the physical demands of delivery, leave your abdominal muscles, pelvic floor, and connective tissue in a state of recovery rather than readiness. The exercises that served you well before pregnancy can actively work against your healing in the early postpartum period, and the instinct to jump back into intense core training as quickly as possible is one of the most common and consequential mistakes new mothers make.

This guide covers what actually happens to your core during and after pregnancy, what the timeline for safe return to exercise looks like, which exercises belong in each phase of recovery, what diastasis recti is and how to identify it, and how to build a progressive program that restores genuine core strength without setting your recovery back.

What Pregnancy Does to Your Core

Your core is not just your abs. It is a system of four interconnected structures: the diaphragm at the top, the transverse abdominis (your deepest abdominal muscle) wrapping around the sides and front, the multifidus muscles running along the spine at the back, and the pelvic floor at the base. All four work together to create intra-abdominal pressure, stabilize the spine, support the pelvic organs, and transfer force between the upper and lower body.

Pregnancy disrupts every component of this system simultaneously. The uterus stretches the abdominal wall and pushes the pelvic organs down. Relaxin, the hormone that loosens ligaments to prepare for delivery, also reduces the stiffness of the connective tissue that holds the core canister together. The linea alba, the fibrous tissue running vertically between the two halves of the rectus abdominis, stretches and thins to accommodate the expanding uterus. In many women, this produces diastasis recti abdominis (DRA), a separation between the two sides of the rectus abdominis that affects core function and can persist long after delivery.

The pelvic floor, which bears the cumulative load of the growing baby across pregnancy and the acute stress of vaginal delivery or the surgical trauma of cesarean section, is particularly vulnerable. A weakened or dysfunctional pelvic floor is not just an inconvenience. It is the structure that prevents prolapse, supports continence, and provides the foundation on which all core exercise is built.

The Diastasis Recti Conversation

Diastasis recti abdominis affects a significant proportion of postpartum women. Prevalence rates of diastasis recti abdominis among postpartum women vary between 30 and 68 percent, making it common enough that every woman returning to postpartum exercise should understand what it is and how to check for it.

Diastasis recti abdominis is the separation of the rectus abdominis muscles along the linea alba, often occurring during pregnancy due to hormonal and mechanical changes. While DRA usually resolves post-childbirth, some women experience persistent issues.

DRA affects more than appearance. It has been postulated that DRA, in addition to being a cosmetic concern for many women, may reduce low-back and pelvic stability, causing low-back and pelvic girdle pain, and be related to pelvic floor dysfunctions such as urinary incontinence, anal incontinence, and pelvic organ prolapse.

How to self-check for diastasis recti:

Lie on your back with knees bent and feet flat on the floor. Place your fingertips horizontally across your midline at your navel. Slowly lift just your head and shoulders off the floor, as if beginning a crunch. Feel for a gap or soft area between the two muscle bellies. A gap of more than two finger-widths is generally considered significant DRA. Note whether the gap feels firm under tension or remains soft and unsupported, as tissue tension matters as much as gap width.

If you suspect significant DRA, consult a pelvic floor physical therapist before progressing to any loaded core exercise. DRA does not mean you cannot exercise. It means the sequence of exercises matters significantly.

The Safe Return to Exercise Timeline

Exercise routines may be resumed gradually after pregnancy as soon as medically safe, depending on the mode of delivery and the presence or absence of medical or surgical complications. Some women are capable of resuming physical activities within days of delivery.

Pelvic floor exercises can be initiated in the immediate postpartum period. Abdominal strengthening exercises, including abdominal crunch exercises and the drawing-in exercise, a maneuver that increases abdominal pressure by pulling in the abdominal wall muscles, can also be initiated in the early postpartum period.

This does not mean everything is safe immediately. The distinction is between gentle reconnection work — diaphragmatic breathing, pelvic floor contractions, gentle transverse abdominis activation — and loaded core training like crunches, planks, and leg raises, which place significantly more demand on a healing system.

Phase 1: Days 1 to 14 — Reconnection

Gentle diaphragmatic breathing, pelvic floor contractions, and belly breathing with light abdominal activation. No loaded exercise. Suitable for vaginal and cesarean deliveries, though cesarean recovery requires additional caution around the incision.

Phase 2: Weeks 2 to 6 — Gentle Activation

Dead bugs (modified), heel slides, supported bridges. Pelvic floor strengthening involves building in duration and repetitions. Light walking. No high-impact activity, no crunches, no heavy lifting.

Phase 3: Weeks 6 to 12 — Progressive Loading

Begin only after medical clearance at the 6-week appointment. Bird dogs, full bridges, modified planks, and standing core work. New research backs waiting until 12 weeks postpartum to do high-intensity workouts, and many OBGYNs have adjusted their postpartum exercise recommendations accordingly.

Phase 4: 12 Weeks and Beyond — Return to Full Training

Traditional core exercises, progressive resistance training, return to running, and high-impact activity after individual assessment of pelvic floor readiness. Not by calendar alone, but by symptoms: no leaking, no pressure, no pain.

Cesarean section note: C-section is a major abdominal surgery. The healing timeline is longer, and the precautions around incision pressure and abdominal loading are more significant. ACOG actually recommends early mobilization within 24 hours after C-section surgery, and gentle movement is encouraged as soon as it is medically safe. The 6-week clearance is typically for returning to higher-intensity activities like running, heavy lifting, or traditional ab workouts.

Phase 1: Reconnection Exercises (Days 1 to 14)

These exercises are not impressive. They are essential. The goal is to reconnect neural pathways between your brain and your deep core muscles, many of which have been mechanically compressed, stretched, or functionally inhibited during pregnancy. Do not underestimate them.

Diaphragmatic Breathing

Why it matters: Diaphragmatic breathing is the foundation of all postpartum core rehabilitation. The diaphragm is the top of the core canister, and its coordinated movement with the pelvic floor and transverse abdominis is what creates intra-abdominal pressure management. After pregnancy, the diaphragm has been displaced upward by the growing uterus, and its movement pattern is often disrupted. Reestablishing this movement is the first step in core restoration.

How to do it: Lie on your back with knees bent. Place one hand on your chest and one on your belly. Inhale slowly through your nose, directing the breath into your lower ribcage and belly so the belly-hand rises and the chest-hand stays relatively still. On the exhale, let everything release completely. Start with 5 minutes, two to three times daily.

Progression: As you exhale, add a gentle drawing-in of the lower belly toward the spine. This is the beginning of transverse abdominis activation.

Sets and reps: 10 breath cycles, 2 to 3 times daily.

Pelvic Floor Contractions (Kegels)

Why it matters: Research published in PMC confirms that kegel exercises during the postpartum period significantly reduce urinary incontinence, restore pelvic floor muscle strength, and support the structural recovery of pelvic organ support that is compromised by vaginal delivery. The pelvic floor is the foundation on which all other core exercise is built. Strengthening it before loading it is not optional; it is the sequence.

How to do it: Contract the pelvic floor muscles as if stopping the flow of urine and passing gas simultaneously. Hold for 3 to 5 seconds. Release completely and rest for an equal time. The release is as important as the contraction; a pelvic floor that cannot fully relax is as dysfunctional as one that cannot contract.

Important: If kegels cause pain, pressure, or worsen symptoms, stop and consult a pelvic floor physical therapist. Not all postpartum pelvic floor dysfunction is weakness; some women have hypertonic pelvic floors that require release work rather than strengthening.

Sets and reps: 10 contractions held 3 to 5 seconds, 3 to 4 times daily. Build to 10-second holds over 2 weeks.

Phase 2: Gentle Activation Exercises (Weeks 2 to 6)

Heel Slides

Why it matters: Heel slides challenge the transverse abdominis and lower abdominals without creating the intra-abdominal pressure spike that sit-ups and leg raises produce. They are one of the first exercises that load the core in a controlled way while keeping the lumbar spine neutral.

How to do it: Lie on your back with knees bent and feet flat. Exhale and gently draw your lower belly in toward your spine — not a forceful bracing but a subtle engagement. Maintaining this engagement, slowly slide one heel along the floor until the leg is straight. Pause, then slide it back. The lower back should remain in contact with the floor throughout.

Watch for: The lower back arching off the floor as the leg extends, which means the core is not maintaining the position. Reduce the range of motion or perform the exercise with a pillow under the lumbar spine.

Sets and reps: 8 to 10 repetitions per side, 2 sets. Rest 60 seconds between sets.

Dead Bug (Modified)

Why it matters: The dead bug is one of the most effective anti-extension core exercises available because it trains the transverse abdominis and deep stabilizers to resist spinal extension under load, which is the function they need to perform in every daily activity involving lifting, carrying, and bending. The American Council on Exercise identifies the dead bug as one of the safest and most effective core stability exercises for postpartum women because it maintains spinal neutrality throughout and can be progressed gradually as core capacity improves.

Modified version (Weeks 2 to 4): Lie on your back, arms pointing toward the ceiling, knees bent at 90 degrees with legs lifted (tabletop position). Exhale and brace gently. Lower one foot toward the floor without touching it; inhale at the bottom; exhale and return. Alternate sides. Keep the lower back pressed into the floor throughout.

Progression (Weeks 4 to 6): Extend the opposite arm overhead as the leg lowers.

Sets and reps: 6 to 8 reps per side, 2 sets.

Supine Bridge

Why it matters: The glute bridge targets the gluteus maximus and hamstrings, while the core must stabilize the pelvis and lumbar spine against the load of lifting the hips. Cleveland Clinic identifies hip bridges as one of the most effective exercises for restoring posterior chain strength postpartum, as the glutes and hamstrings are commonly inhibited after prolonged sitting during late pregnancy and the early postpartum period.

How to do it: Lie on your back with knees bent and feet hip-width apart. Exhale and gently engage the pelvic floor and transverse abdominis. Press through both heels and lift the hips until shoulders, hips, and knees form a straight line. Hold 2 seconds at the top. Lower slowly.

Watch for: Overextension at the top of the movement (arching the lower back to pushthe  hips higher). The position should feel stable and comfortable, not strained.

Sets and reps: 10 to 12 repetitions, 2 to 3 sets.

Clamshells

Why it matters: Clamshells target the gluteus medius and hip external rotators, which are commonly weak postpartum due to the widened stance and altered gait of late pregnancy. Hip abductor weakness contributes to pelvic instability and low back pain that many new mothers experience.

How to do it: Lie on your side with hips and knees bent at 45 degrees, feet together. Keeping feet stacked, rotate the top knee upward like a clamshell opening. Pause at the top without rolling the pelvis backward. Lower slowly.

Sets and reps: 15 repetitions per side, 2 sets.

Phase 3: Progressive Core Loading (Weeks 6 to 12, After Medical Clearance)

Bird Dog

Why it matters: The bird dog trains anti-rotation and lumbar stability simultaneously, requiring the core to resist the rotational force created by extending the opposite arm and leg. Mayo Clinic identifies exercises like the bird dog as foundational for lower back stability and core strength rehabilitation, making it one of the most useful exercises for addressing the back pain that frequently accompanies postpartum recovery.

How to do it: Begin on hands and knees with wrists under shoulders and knees under hips. Exhale and brace gently. Slowly extend the right arm forward and the left leg back simultaneously, forming a straight line from fingertips to heel. Hold 3 to 5 seconds. Return slowly. Alternate sides.

Watch for: The hips rotating or hiking as the leg extends. Keep both hip bones pointing toward the floor throughout.

Sets and reps: 8 to 10 reps per side, 2 to 3 sets.

Modified Plank (Knees Down)

Why it matters: A randomized controlled trial in 2024 found that both six-week conventional exercise programs and hypopressive exercise programs significantly reduced the inter-recti distance in postpartum women with diastasis recti, and the planking position was among the conventional exercises studied. However, the key is starting with the modified version and assessing for DRA-related doming (a visible ridge along the midline) before progressing to full plank.

How to do it: Begin on hands and knees. Walk the knees back until the body forms a diagonal line from knees to head. Engage the pelvic floor and draw the lower belly gently toward the spine. Hold this position with a neutral spine. Do not allow the hips to sag toward the floor or pike upward.

DRA check: Look at your midline during the hold. A visible ridge or coning along the center of the abdomen indicates the exercise is too demanding for your current tissue recovery. Return to dead bugs and heel slides.

Progression to full plank: Once the modified plank is comfortable for 30 seconds with no doming, progress to feet-supported plank, maintaining the same body position cues.

Sets and reps: Hold 10 to 20 seconds, 3 to 5 sets. Build toward 30 seconds over 2 to 3 weeks.

Standing Core Work (Pallof Press Variation)

Why it matters: Standing core exercises are functionally more relevant to daily postpartum life than floor-based exercises because they train the core in the position it must work in while carrying, lifting, feeding, and moving with a baby. A resistance band anchored to a door at chest height creates a rotational challenge that the core must resist.

How to do it: Stand sideways to a door with a resistance band at chest height. Hold the band with both hands at your chest. Step away from the anchor until there is tension in the band. Press both hands straight out in front of you; the band will pull you toward the anchor. Resist the rotation for 2 seconds. Return hands to chest. Repeat.

Sets and reps: 10 reps per side, 2 to 3 sets.

Phase 4: Return to Full Training (12 Weeks and Beyond)

Full Plank with Progressions

Progress from the modified plank to a full plank, then to plank variations including shoulder taps, plank with leg lift, and eventually RKC plank (maximum tension). The progression is governed by symptoms, not calendar. No leaking, no pressure, no pain, and no visible doming throughout.

Functional Core Exercises

Dead lifts, squats, farmer’s carries, and overhead pressing all engage the core under significant load and are appropriate for most women at 12 weeks postpartum with cleared pelvic floor function and no significant DRA. These compound movements build the integrated whole-body strength that postpartum women need for the physical demands of childcare, not just isolated abdominal appearance.

Traditional Abdominal Exercises

Crunches, sit-ups, and leg raises can be reintroduced at 12 weeks postpartum for women with no significant DRA and good pelvic floor function. They are not superior to the compound and stability exercises above for building functional core strength, but they are not inherently harmful when introduced at the appropriate stage of recovery.

Exercises to Avoid in the Early Postpartum Period

Weeks 1 to 6: Crunches, sit-ups, double leg raises, full planks, any exercise that causes visible doming along the midline, high-impact activity, heavy loading.

Signs any exercise is too much, too soon:

• Leaking urine during or after exercise
• Heaviness or pressure in the pelvic region
• Visible coning or doming along the midline during abdominal exercises
• Lower back or pelvic girdle pain that persists after exercise
• Pain at the pubic symphysis

Any of these symptoms are signals to reduce load, regress to an earlier phase, and consult a pelvic floor physical therapist.

The Role of Pelvic Floor Physical Therapy

The single most impactful step a new mother can take for postpartum core recovery is a session with a pelvic floor physical therapist. Despite exercise being the standard approach to diastasis recti rehabilitation, there is no consensus on the most effective exercise routine, and the variability in individual presentations, severity, and pelvic floor function means that a personalized assessment is far more valuable than any generic exercise program, including this one.

A pelvic floor PT will assess DRA severity using ultrasound or manual examination, evaluate pelvic floor strength and tension, identify any prolapse symptoms, and create an individualized progression. Many insurance plans cover postpartum pelvic floor physical therapy; check your coverage and request a referral at your 6-week appointment if your provider does not automatically offer one.

A Sample Weekly Schedule (Phase 3, Weeks 6 to 12)

The Bottom Line

Postpartum core recovery is not a race. The goal in the first six to twelve weeks is not to look a certain way. It is to rebuild a system that has been fundamentally altered by pregnancy and delivery in a sequence that supports healing rather than bypassing it.

ACOG confirms that exercise in the postpartum period helps strengthen abdominal muscles, boosts energy, may prevent postpartum depression, promotes better sleep, relieves stress, and can help with weight management. The exercises that achieve all of those outcomes most safely are not the hardest ones available. They are the ones that match the stage of recovery, respect the symptoms the body is communicating, and progress deliberately from reconnection to loading over weeks rather than days.

Start where you are. Progress when the body is ready. Consult a pelvic floor physical therapist at any point where symptoms suggest something is not resolving. The core you build through a thoughtful postpartum recovery will serve you better in the long run than any approach that prioritizes speed over healing.

Always consult your healthcare provider before beginning any postpartum exercise program, particularly after cesarean delivery, complicated births, or if you are experiencing pelvic floor symptoms, including leaking, prolapse, or pelvic pain. This article does not constitute medical or physical therapy advice.