If you have had a baby, there is a reasonable chance someone has mentioned diastasis recti to you. Your midwife might have checked for it at your six-week postnatal visit. Your physio might have brought it up when you asked about returning to exercise. You might have seen it on Instagram, described as the cause of the “mummy tummy” that will not go away no matter what you do.
There is also a reasonable chance that everything you have heard about it has been confusing, contradictory, or alarming. One source says you must avoid all abdominal exercises. Another says you need to do specific core exercises every day. One says it will close on its own. Another says you need surgery. One influencer sells a program that claims to “fix” it in 12 weeks. A physio tells you it is complicated.
The reality sits somewhere in the middle of all of this noise. Here is what the current research actually says.
What Diastasis Recti Actually Is
Diastasis recti abdominis (DRA) is a separation of the two sides of the rectus abdominis muscle, the paired muscle that runs vertically down the front of your abdomen. These two muscle bellies are connected by a strip of connective tissue called the linea alba.
During pregnancy, the linea alba stretches to accommodate the growing uterus. This is normal. It happens in virtually all pregnancies, particularly in the third trimester. Research published in the British Journal of Sports Medicine found that up to 100% of women have some degree of abdominal separation by the end of pregnancy.
After birth, this separation naturally narrows in most women. The linea alba gradually recovers tension and the gap between the muscle bellies reduces. For many women, significant recovery happens in the first eight weeks postpartum.
The clinical question is not whether separation occurs (it does, in nearly everyone) but whether the separation persists, and whether the connective tissue recovers enough tension to function effectively. A gap that remains wider than roughly two finger-widths at eight to twelve weeks postpartum is generally considered a clinically relevant diastasis recti.
How Common Is It?
More common than most people realise.
A Norwegian study published in the British Journal of Sports Medicine followed 300 first-time mothers and found that roughly 33% still had a diastasis recti at 12 months postpartum. Other studies have reported prevalence rates of 35% to 39% at six months after delivery.
These numbers mean that for every three women in a postnatal exercise class, one is likely dealing with some degree of abdominal separation. It is not a rare condition. It is not a failure of the body. It is a common consequence of pregnancy that responds well to the right kind of rehabilitation.
The Gap Width Is Not the Whole Story
For years, the fitness and physiotherapy world focused almost exclusively on the width of the gap. How many fingers fit in the space? Can you close it? The goal was to get the gap as narrow as possible.
More recent research has shifted this focus significantly. What matters as much as gap width, and possibly more, is the tension and function of the linea alba.
A study published in the Journal of Orthopaedic and Sports Physical Therapy demonstrated that some women with a measurable gap can generate effective tension across the linea alba and have normal core function. Meanwhile, some women with a narrower gap cannot generate adequate tension, leaving them functionally compromised despite the gap appearing “closed.”
In practical terms, this means the goal of diastasis recti rehabilitation is not just to close the gap. It is to restore the ability of the abdominal wall to function as a unit: transferring load, stabilising the spine, and supporting the pelvic organs.
This distinction matters because it changes the exercise approach. Exercises that only target the superficial rectus abdominis (traditional crunches, sit-ups, planks held to failure) can actually increase the pressure that pushes the gap wider without improving the underlying tension in the connective tissue. The more effective approach is to retrain the deep core system first, then progressively challenge it.
What the Evidence Says About Exercise for DRA
Here is where the research is genuinely encouraging: exercise works.
A systematic review published in the Journal of Women’s Health Physical Therapy found that targeted exercise programs focusing on the deep core muscles (transverse abdominis, pelvic floor, and multifidus) produced significant improvements in inter-recti distance and functional outcomes in postpartum women.
Another review in Physiotherapy found that supervised exercise programs were more effective than unsupervised home programs, likely because correct technique matters enormously for these exercises and is difficult to learn without feedback.
The evidence supports a specific type of exercise approach for diastasis recti recovery:
Start with deep core activation. Learning to engage the transverse abdominis (the deepest abdominal layer) and coordinate it with pelvic floor activation and breathing is the first step. This is not about doing hundreds of repetitions. It is about learning a motor pattern that most people have never consciously practiced.
Progress to loaded movements gradually. Once the deep core is firing effectively, exercises that challenge the system under load can be added. This is where reformer pilates becomes particularly valuable: the springs provide controlled, variable resistance that can be precisely calibrated to the client’s current ability.
Avoid exercises that spike intra-abdominal pressure. Traditional crunches, full sit-ups, and exercises that cause visible “doming” or “coning” along the midline of the abdomen can be counterproductive in the early stages of recovery. As the linea alba recovers tension, these exercises may eventually be appropriate, but timing matters.
Prioritise consistency over intensity. DRA recovery is a slow process measured in weeks and months, not days. Two to three sessions per week of appropriate exercise, sustained over 12 or more weeks, produces the best outcomes in the research.
Where Reformer Pilates Fits In
Reformer pilates is not the only effective exercise for diastasis recti recovery. But it has several characteristics that make it particularly well suited.
Adjustable resistance. The spring system on a reformer allows resistance to be increased in very small increments. This means a postpartum client can start with the lightest load and progress gradually as their core function improves. Unlike bodyweight exercises, where the load is fixed at your body weight, the reformer can be set lighter than bodyweight for supported movements.
Supine, side-lying, and supported positions. Many early-stage DRA exercises are done lying on the back or on the side. The reformer’s padded carriage provides a comfortable, supportive surface for these positions. The straps and springs allow exercises to be performed in positions that reduce gravitational load on the healing abdominal wall.
Instructor-guided form correction. The deep core activation patterns required for DRA recovery are subtle and difficult to learn from a video or written description. Having an instructor who can watch your movement, cue your breathing, and identify compensation patterns is significantly more effective than training alone. Research supports this: supervised programs outperform unsupervised ones.
Integrated full-body approach. DRA does not exist in isolation. The pelvic floor, hips, thoracic spine, and breathing mechanics all interact with abdominal wall function. Post-natal pilates classes address the whole system rather than isolating one muscle group.
At Semprose, pregnancy and postnatal pilates classes are structured to work with clients through the recovery timeline, starting with foundational breath and activation work and progressing toward full reformer exercises as the body allows.
What About Surgery?
Surgical repair (abdominoplasty with diastasis repair) is sometimes presented as the only “real” solution for diastasis recti. In certain cases, particularly where the separation is very wide (more than four to five finger-widths) and conservative rehabilitation has not produced functional improvement after a sustained effort, surgery may be appropriate.
But surgery is not the first-line treatment. Clinical guidelines and physiotherapy bodies generally recommend a supervised exercise rehabilitation program lasting at least three to six months before considering surgical options. Many women who follow a structured rehabilitation program find that their functional outcomes improve enough that surgery is unnecessary.
The decision about surgery is personal and should be made with a qualified medical professional who can assess your specific situation. It is not something an exercise studio, a blog post, or an Instagram account can advise on.
The Exercises That Help vs the Exercises That Do Not
This is where misinformation runs rampant. The internet is full of “diastasis recti exercise programs” that include exercises ranging from appropriate to actively harmful. Here is a simplified framework based on current evidence:
Generally appropriate in early recovery: diaphragmatic breathing with core activation, pelvic floor engagement coordinated with breath, heel slides, toe taps, bridging with deep core activation, side-lying clam exercises, supported reformer footwork with light springs.
Appropriate once foundational control is established: bird-dog variations, modified reformer exercises with increasing spring resistance, standing balance work, supported planks with proper alignment.
Potentially counterproductive in early recovery: traditional crunches, full sit-ups, heavy loaded twisting, exercises that cause visible doming or bulging along the linea alba, high-impact jumping or running before the pelvic floor and core can manage the load.
The key word in all of this is “potentially.” Individual responses vary. What is inappropriate at week six postpartum might be perfectly fine at week twenty. This is why supervised, progressive exercise with a qualified instructor is more effective than following a generic program.
The Timeline Nobody Wants to Hear
Meaningful diastasis recti recovery takes time. The research suggests that most women who follow a consistent, appropriate exercise program see significant improvement over three to six months. Some women continue to improve beyond that window.
This does not mean you will feel bad for six months. Many women notice functional improvements (less back pain, better posture, improved pelvic floor control) within the first few weeks of starting a structured program. The abdominal wall itself takes longer to adapt structurally, but the benefits of exercise show up well before the gap measurement changes.
Patience is difficult, especially when you are postpartum, sleep-deprived, and desperate to feel like yourself again. But the evidence is clear: consistent, progressive, supervised exercise produces real results. It just requires time and the willingness to start gently.
When to See a Professional
If you suspect you have diastasis recti, the first step is assessment by a qualified professional. A women’s health physiotherapist can measure the separation, assess the tension of the linea alba, evaluate your pelvic floor function, and create a rehabilitation plan tailored to your body.
Once you have a clear picture of where you are, a structured exercise program like post-natal reformer pilates provides the progressive, supervised, full-body approach that the evidence supports.
Starting with a professional assessment and then building your exercise practice on that foundation is the safest and most effective path. It is not the fastest. But it is the one that produces lasting results.
Ready to Start Your Recovery?
If you are postpartum and want to rebuild your core safely, contact Semprose to learn about our pre and post-natal pilates classes. We will work with your body, your timeline, and your recovery goals.
