Diastasis Recti Self-Check and Core Recovery: What to Do Before Crunches

If the scariest moment of your day is bending over the sink to wash your face, and you have seen your belly tent up in a vertical ridge right at that moment, this article is written for exactly that situation. A lot of people hear the words you can exercise again at the 6-week postpartum checkup, go straight back to the sit-ups or planks they used to do, and end up feeling like their belly is gaping open even more than before.

That gap is usually diastasis recti: the linea alba, the connective tissue running vertically down the middle of your abdomen, stretches during pregnancy and childbirth so the two sides of the rectus abdominis sit farther apart. The problem is that curling the trunk forward hard, the way a crunch or sit-up does, sends pressure straight into that already-thinned tissue and can push it wider instead of closing it. So this article walks through, in order: a finger-gap self-test you can do at home, the breathing and transverse-abdominis sequence to run before any crunch, and a concrete 6-week program that raises the difficulty stage by stage. If you want a broader core foundation first, the 4-week beginner core program is worth reading alongside this one.

Diastasis Recti Self-Check: Measuring the Gap With Your Fingers

Diastasis recti is not a rare condition. Sperstad and colleagues tracked more than 300 women in a 2016 study in the British Journal of Sports Medicine and found that roughly one in three still had diastasis recti 12 months after giving birth. The same study found the risk was higher with more pregnancies and higher body weight at delivery, but it also reported that the link to low back or pelvic pain was not statistically clear, a limitation that makes it hard to say the gap itself is the direct cause of pain.

You can check where you currently stand right at home.

Starting position Lie on your back on the floor or a bed, knees bent, feet flat. Rest two or three fingers of one hand horizontally just above your navel.

Check steps ① Exhale comfortably and relax your belly. ② Lift your head and shoulders just a few centimeters off the floor into a mini curl-up to tense the rectus abdominis. ③ Press your fingers gently into the midline and feel how many fingers fit between the two muscle bellies, and whether the floor of that gap feels firm or mushy. ④ Repeat the same check at the navel itself, about 4 to 5 cm above it, and about 4 to 5 cm below it.

Interpreting it A gap of about two finger-widths, roughly 2 to 2.5 cm, or more is commonly used as a cutoff for diastasis recti, but that threshold shifts slightly between studies and measurement points. The finger method is a screening tool that is less precise than ultrasound or caliper measurement, so treat the number as a rough guide, as in the table below, and get a proper assessment from a physical therapist if it is unclear.

There is a sign more important than the number itself. Watch for doming, where the midline tents up into a vertical ridge during the mini curl-up, or coning, where it pokes up in a cone shape. Even with only a two-finger gap, clear doming means the linea alba cannot handle the current load, and that functional sign should take priority over the raw finger count.

Why Crunches Actually Widen the Gap

A crunch or sit-up curls the trunk toward the spine, which strongly contracts the rectus abdominis. That contraction also spikes intra-abdominal pressure for a moment, and that pressure pushes outward against a linea alba that is still thin and has lost some elasticity. If the muscles that normally support that pressure from the inside, the transverse abdominis and pelvic floor, are not switched on first, the force leaks straight out toward the midline.

This has been shown experimentally. Mota and colleagues, in a 2015 study in the Journal of Orthopaedic and Sports Physical Therapy, used ultrasound to compare the distance between the two rectus abdominis muscles in pregnant and postpartum women during an abdominal crunch versus a drawing-in maneuver, where the navel is pulled inward using the transverse abdominis. The inter-rectus distance above the navel widened significantly during the crunch, while it did not increase, and sometimes decreased, during the drawing-in maneuver. The study only measured the instantaneous change during the movement, though, so it could not confirm whether repeating crunches over the long term permanently stretches the tissue.

None of this means core exercise itself should be abandoned. A 2014 systematic review by Benjamin and colleagues in Physiotherapy pooled several studies of transverse-abdominis-focused exercise programs during pregnancy or postpartum and found a trend toward a smaller inter-rectus gap compared with groups that did not exercise. The authors themselves note that most of the included studies had small sample sizes and used inconsistent exercise protocols and measurement methods, so the evidence sits at a low to moderate level. Taken together, the evidence so far points toward exercises that engage the transverse abdominis first being safer and more likely to help than movements like crunches that suddenly spike intra-abdominal pressure.

Before Any Crunch: Waking Up Breathing and the Transverse Abdominis

So what should you do first while the gap is still open? The answer is simpler than it sounds: relearn how to breathe and how to feel the muscle behind your navel working. Both moves below can usually start no matter how many weeks postpartum you are, as long as your doctor has not restricted activity.

Diaphragmatic Breathing

Starting position Lie on your back on the floor or a bed, knees bent, feet flat. Place one hand on your chest and one hand below your navel.

Movement steps ① Inhale slowly through your nose over 3 to 4 seconds, letting the hand on your belly rise gently. ② Keep the hand on your chest as still as possible. ③ Exhale through your mouth over about 6 seconds, letting your belly fall naturally. ④ At the very end of the exhale, add a light draw of the navel toward the spine.

Breathing timing Inhale for 3 to 4 seconds, exhale for about 6 seconds, keeping the exhale longer than the inhale.

Sets, reps, frequency 10 breaths per set, 2 to 3 sets a day, every day.

Common mistakes and fixes The chest hand rising first is the most common error. Rest a thin book on your belly and watch whether only the book rises and falls to lock in the sensation. Forcing the belly in hard on the exhale spikes intra-abdominal pressure instead, so let it deflate naturally, like air slowly leaving a balloon.

Stop if this happens Dizziness or tingling in your hands or feet during this breathing signals hyperventilation. Return to normal breathing for about 30 seconds before continuing, and stop for the day if it keeps happening.

Transverse Abdominis Bracing, or Drawing-In

Starting position Stay in the same position as the breathing exercise.

Movement steps ① Repeat the breathing above twice to release tension. ② Exhale and slowly draw your navel toward your spine as if tightening a corset, more a narrowing from the sides inward and down than a flat press. ③ At the same time, lift the pelvic floor gently, about as much as an elevator rising one floor, using roughly 30 percent of maximum effort. ④ Hold that tension for 5 to 10 seconds while continuing to breathe shallowly, without holding your breath. ⑤ Release slowly back to the starting state.

Breathing timing Start the draw-in on an exhale, and keep breathing throughout the hold. Never hold your breath.

Sets, reps, frequency 10 holds of 5 to 10 seconds, 2 sets a day, 5 to 6 days a week.

Common mistakes and fixes The most common error is pressing the belly flat with force, which uses the rectus abdominis rather than the transverse abdominis. Try imagining a thin belt wrapping around your waist as you exhale instead. Many people also crush their ribs downward and hold their breath, so check that you can still take small breaths during the hold.

Stop if this happens If the midline domes up above or at the navel while you draw in, you are using too much force. Back off to about 30 percent effort immediately, and if it still appears, do only the breathing drill for that day.

Weeks 1 to 2: Safe Core Work Lying Down

Once breathing and bracing feel reasonably natural, you are ready for the next step. Both moves below add leg movement while holding the brace, essentially practice at withstanding pressure without losing it.

Pelvic Tilt

Starting position Lie on your back, knees bent, feet flat.

Movement steps ① Exhale and brace the transverse abdominis at about 30 percent effort. ② While holding that, roll your pelvis very slightly backward so the natural curve of your low back lightly presses into the floor, like curling the pubic bone up toward your navel. ③ Hold for 2 to 3 seconds. ④ Inhale and slowly return to the start.

Breathing timing Brace and roll on the exhale, release on the inhale.

Sets, reps, frequency 10 reps, 2 to 3 sets, daily or every other day.

Common mistakes and fixes A common error is lifting the hips entirely off the floor, turning this into a bridge. Keep your hips on the floor and think of the pelvis tilting like a seesaw, just barely. Pressing the low back forcefully into the floor is also the wrong cue; let the curve flatten naturally instead.

Stop if this happens If you feel a sharp pain low in your back, or the midline domes up, stop for the day and try again the next day at a lower effort.

Heel Slide

Starting position Same position as the pelvic tilt.

Movement steps ① Hold the transverse abdominis brace at about 30 percent effort. ② Keeping one heel on the floor, slide it away slowly to straighten that leg. ③ Check that your belly stays flat, then slide the heel back to the start.

Breathing timing Keep exhaling and breathing as the leg extends, inhale as it returns.

Sets, reps, frequency 8 to 10 reps each side, 2 sets, 5 days a week.

Common mistakes and fixes If your belly domes or your low back lifts slightly off the floor as the leg extends, your core is not yet handling the weight of the leg. Bend the knee a little instead of straightening it fully, and shorten the range. The trick is to stop the slide right before the point where the belly starts to rise.

Stop if this happens New or worsening leg numbness or radiating pain, increasing back pain, or doming — stop right away.

Weeks 3 to 6: Adding Limb Movement to Build Core Strength

Once the heel slide feels comfortable with no doming, it is time to add movements that use your arms and legs together. From here, your core has to keep your trunk from wobbling, so focus on holding position rather than speed.

Modified Dead Bug

Starting position Lie on your back with both knees bent to 90 degrees, tabletop position, arms reaching toward the ceiling. Hold the transverse abdominis brace.

Movement steps ① While holding the brace, slowly lower one arm overhead, keeping the legs still. ② Return it to start. ③ Once that feels easy, try lowering the opposite leg just until the heel lightly taps the floor, keeping the knee at 90 degrees. ④ Only move within the range where your low back does not lift off the floor.

Breathing timing Exhale as the arm or leg lowers, inhale as it returns.

Sets, reps, frequency 6 to 8 reps each side, 2 sets, 4 to 5 days a week.

Common mistakes and fixes Lowering the leg too far so a gap opens under your low back big enough to fit a palm is a common error. If you feel that gap, lower only halfway. Pressing the opposite leg into the floor to brace is another common habit; relax that leg and practice holding position with the core alone.

Stop if this happens Doming, back pain, or leg numbness — drop back to the easier version that moves only the arm for that day.

Bird Dog

Starting position Get into a hands-and-knees position, wrists directly under shoulders, knees directly under hips. Hold the transverse abdominis brace.

Movement steps ① While holding the brace, reach one arm forward to shoulder height. ② At the same time, extend the opposite leg back to hip height. It is fine to start with just an arm or just a leg alone. ③ Hold for 2 to 3 seconds, checking that your low back does not sway side to side or sag. ④ Return slowly to start and repeat on the other side.

Breathing timing Exhale as you reach, keep breathing during the hold, inhale as you return.

Sets, reps, frequency 6 to 8 reps each side, 2 to 3 sets, 4 days a week.

Common mistakes and fixes The low back sagging into an arch is the most common mistake; only reach as far as you can while keeping the sense of the navel drawn toward your spine. The opposite hip rotating and twisting the torso is also common — imagine a cup of water balanced on each side of your pelvis and keep it level.

Stop if this happens Wrist pain can usually be fixed by adjusting hand position, but if the midline domes or back pain becomes clear, drop to the easier version with knees down and only the arm reaching.

Standing Braced March

Starting position Stand with your whole back against a wall, feet stepped about one pace forward from it. Hold the transverse abdominis brace.

Movement steps ① While holding the brace, slowly lift one knee to hip height. ② Hold for about 2 seconds, then lower slowly. ③ Repeat with the other leg.

Breathing timing Exhale as the knee lifts, inhale as it lowers.

Sets, reps, frequency 8 reps each side, 2 sets, 3 to 5 days a week. Easy to fit in while waiting for dishes to finish or while brushing your teeth.

Common mistakes and fixes The pelvis tilting toward the opposite side as the knee lifts is common. Use full back contact with the wall as your benchmark; if your back peels away, lower the knee height until it does not.

Stop if this happens Dizziness severe enough to affect your balance, or a domed belly — stop immediately and sit down to rest.

6-Week Progression Table: Weekly Intensity and Level-Up Criteria

If you are unsure what to do and how much on a given day, use the table below as your guide. It only shows an average pace, though; if you have not met the doming-free level-up criteria for a stage, do not move on — repeat that week instead.

Still stuck at weeks 3 to 4 after six weeks? That is not failure. Recovery speed varies widely by number of pregnancies, whether you had a C-section, and how wide the gap started out, and 8 to 12 weeks is not unusual. What matters is following each stage's criteria without doming, not finishing in a fixed timeframe.

You need almost no equipment. A bedroom rug or living room floor works instead of a mat, and the standing move fits into a narrow spot by the kitchen or bathroom. Many people fit this into a nap window or the 30 minutes right after putting the baby to bed at night, and one towel is enough to pad under the knees if needed.

When to Avoid This: Contraindications and Warning Signs

This program is meant for a normal postpartum recovery process, not as a substitute for a medical diagnosis or prescribed treatment. See an OB-GYN or a pelvic floor physical therapist first if any of the following apply to you.

• Lochia (postpartum bleeding) that darkens again or increases in amount
• A C-section incision that has not yet healed, or signs of infection such as redness, warmth, or discharge, usually under 6 to 8 weeks
• Suspected hernia — a specific spot near the navel or incision that bulges and does not go back in with pressure
• Symptoms of pelvic organ prolapse, such as a feeling of fullness or heaviness inside the vagina
• Postpartum hypertension, preeclampsia, or any condition where a clinician has recommended restricted activity
• A finger gap of 5 cm or more, or fingers sinking in deeply with no firm floor

Even if none of the above applies, stop immediately if any of these appear during exercise.

• Leaking urine, worsening incontinence, or an increasing feeling of pelvic heaviness
• New or worsening numbness or radiating pain down a leg
• Back or pelvic pain clearly worse than before you started
• Doming at the midline that keeps recurring even after you lower the intensity
• Dizziness, cold sweats, or unusual severe fatigue

The finger self-test is a screening tool only; an accurate diagnosis needs caliper or ultrasound measurement from a pelvic floor physical therapist. If your result is unclear or the warning signs above keep recurring, it is safer to get checked than to keep going on your own judgment.

Near-infrared LED is not a medical device that replaces this core work or directly closes the linea alba — think of it as a wellness tool that supports recovery around your workouts. Do not apply it directly over a C-section incision that has not healed, never shine it directly into the eyes, and check with your doctor first if you are taking a photosensitizing medication. For a broad area like the abdomen, many people use it at a 5 to 30 cm distance for 10 to 15 minutes per session, 3 to 5 times a week, though the right duration varies with skin condition and individual factors.