5 Exercises That Make Diastasis Worse — Stop Doing These

You had a baby. You want your core back. You go to the obvious places: planks, sit-ups, pilates, hot yoga, maybe the workout videos that promised "flat abs by 12 weeks."

Three months in, your belly still bulges. Your gap has not closed. Sometimes it looks worse. You are doing more, not less, and going backward.

Here is what most fitness content does not tell you. Five common exercises actively widen diastasis recti when done with a separated linea alba. They are the exercises most people default to. Stop doing them, and recovery often resumes within weeks.

This is not about avoiding exercise postpartum. It is about avoiding the wrong exercises until the deep system is rebuilt.

Quick Refresher On Diastasis Recti

Pregnancy stretches the linea alba (the connective tissue between your two rectus abdominis muscles) to create space for the growing baby. After delivery, that tissue is supposed to recoil and bring the muscles back together.

In about 40% of women, it does not fully recoil. The gap (called diastasis recti or DRA) persists. A gap of more than 2 finger-widths above or below the navel at 8 weeks postpartum is generally considered diastasis.

More important than the gap itself is the integrity of the connective tissue. A small gap with firm, supportive tissue is functionally fine. A larger gap with soft, doming tissue is the problem.

For the self-test and how to check your tissue integrity, see diastasis recti self-test and fix.

The 5 Exercises That Make It Worse

1. Crunches and Sit-Ups

The single biggest culprit. Every crunch creates intra-abdominal pressure that pushes outward against the linea alba.

If you watch your belly during a crunch with diastasis, you will see one of two things: a vertical bulge running from sternum to pubic bone (called doming), or a sunken trough between the muscles. Both are signs of pressure failing through the gap rather than being managed by the deep core.

Doming repeated hundreds of times per week stretches the linea alba in the wrong direction and stalls recovery indefinitely.

What to do instead: heel slides, dead bugs (with proper form), modified bird dogs. These build deep core function without flexion-based pressure.

2. Full Planks

Front planks load the entire anterior chain, but for a body with diastasis, the load passes through the weakest point. The result is bulging or doming under the planking, even when it does not look like it from the outside.

Women often hold their plank longer thinking they are strengthening their core. They are training their core to fail through the gap.

What to do instead: incline planks (hands on a counter, body angled up), kneeling planks held for short periods (15 seconds) with active focus on no doming. The position should challenge the deep core without overloading it.

Most women can return to full planks safely around 4 to 6 months postpartum, after the deep system is rebuilt. Earlier than that, the cost outweighs the benefit.

3. Russian Twists And Rotational Ab Work

Twisting movements with the spine flexed (like Russian twists with feet off the floor) combine flexion pressure with shear force across the linea alba. This is the worst-case scenario for connective tissue under repair.

Bicycle crunches, oblique sit-ups, and any seated rotational ab move with weight fall in the same category.

What to do instead: standing Pallof presses, side planks (modified, on knee), gentle rotational work without the spine flexed.

4. Loaded Squats Without Breath Coordination

The squat itself is not the problem. The breath pattern most women use under load is.

The default is to inhale, hold breath, drive up. That breath-hold is a Valsalva maneuver, and it spikes intra-abdominal pressure. With diastasis, the pressure has nowhere to go except outward through the gap.

Result: visible doming on the upward phase of the squat, even with relatively light weight.

What to do instead: keep squats as a movement pattern but exhale on the way up. Match breath to movement. Light weight or bodyweight only for the first 8 to 12 weeks of return-to-fitness. Add load only after the breath pattern is consistent and there is no doming.

This applies to deadlifts, kettlebell swings, lunges, and any compound lift.

5. Inverted Yoga Postures

Handstands, headstands, and even sustained downward dogs put the body in positions that load the abdominal wall in unusual ways. Without good pressure management, these can pull the linea alba further apart, particularly in the early postpartum window.

The demand is more subtle than crunches but the cumulative damage from a daily yoga practice can be significant.

What to do instead: skip inversions for the first 4 to 6 months postpartum. Modify or skip downward dog if you see doming when you check. Reintroduce gradually and with attention to deep core engagement.

Many yoga teachers are not trained in diastasis assessment. "Listen to your body" is not enough guidance here, because the doming is often invisible to the person doing the move.

What To Actually Do Instead

The deep core has to come back online before the surface core can be loaded. Order of operations matters more than intensity.

Phase 1 (Postpartum Week 1 to 6): Foundation

Diaphragmatic breathing. Pelvic floor connection. Heel slides. Glute activation.

For a day-by-day breakdown, see postpartum week 1 recovery plan.

Phase 2 (Week 6 to 12): Deep Core Engagement

Dead bugs (lower back stays flat against the floor, breath coordinated with movement). Bird dogs (slow, controlled, no doming). Side-lying clamshells. Glute bridges with breath.

Focus is on quality, not reps. 10 to 15 reps per exercise, 3 sets. The deep core should engage on every rep without doming or breath-holding.

Phase 3 (Week 12 to 24): Functional Loading

Goblet squats with breath coordination. Single-leg deadlifts. Suitcase carries. Modified push-ups (incline).

Load starts low. Progression is based on the absence of doming, not perceived effort.

Phase 4 (Month 6+): Return To Strength

Loaded squats, deadlifts, push-ups, eventually planks and other higher-demand work. By this point the deep system should be reliable enough to handle these.

This is the timeline for a typical recovery. Some women take longer (especially after multiple pregnancies, c-sections, or significant diastasis). Some are ready earlier. The marker is functional, not calendar-based.

How To Tell If An Exercise Is Working For You

During any abdominal work, check three things:

1. Doming or coning along the midline. If you see a vertical bulge from sternum to pubic bone, the exercise is too much.

1. Breath pattern. If you are holding your breath or grunting, intra-abdominal pressure is spiking. The exercise is exceeding your current pressure management capacity.

1. Pelvic floor sensation. If you feel heaviness, pressure, or anything dropping during or after the exercise, you are loading the floor beyond what it can absorb. Stop and back off.

If any of these are present, the exercise is not appropriate yet. Modify or replace.

What Most Postpartum Workout Programs Get Wrong

They skip Phase 1 and 2. Most online programs start at Phase 3 or 4 by week 6. The deep system is not ready, the work fails, and women blame themselves.

They use generic timelines. "6-week postpartum return to fitness" assumes one body type, one delivery type, one set of pre-pregnancy fitness markers. None of which describes most women.

They emphasize aesthetics over function. The goal is not flat abs in 12 weeks. The goal is a deep core that protects the spine, supports the pelvic floor, and handles the demands of motherhood for the next 30 years.

They ignore breath coordination. The diaphragm-pelvic-floor relationship is the foundation of every exercise. Programs that do not address it cannot be effective long-term.

For more on why the breath-pelvic-floor connection matters more than isolated muscle work, see core breath vs kegel.

When To Get Professional Help

A pelvic floor PT or postpartum-trained personal trainer can save you months of guesswork.

Get assessed if:

• You have a 3+ finger gap at 12 weeks postpartum
• Doming is present in basic moves like dead bugs
• You have any leaking, heaviness, or pelvic pain
• You are 6 months postpartum with no improvement despite consistent work
• You want to return to high-impact sport (running, lifting, CrossFit)

A single 60-minute assessment with a qualified provider is often more useful than 6 months of generic online programs.

A Realistic Mindset

Returning to pre-pregnancy fitness takes 6 to 18 months for most women, not 6 to 12 weeks. The fitness industry timeline is not based on physiology. It is based on selling programs.

Women who follow the slower, deeper path consistently end up stronger and with better function than those who rush back. The rushers often spend years dealing with leaking, prolapse, or persistent doming because the foundation was skipped.

The good news is that the work itself is not particularly time-consuming. 15 to 20 minutes per session, 3 to 4 sessions per week, done correctly, produces real results. The challenge is patience, not effort.