Exercise narrows the postpartum ab gap, and starting early helps most

Diastasis recti, a separation of the paired rectus abdominis muscles, is a prevalent condition after pregnancy, yet there has been limited consensus on whether it can be managed well without surgery. Women are frequently told to try exercise first, but the evidence behind that advice has been scattered across small trials using different programmes. The question this review set out to answer is simple and practical: do structured exercise programmes actually close the gap, and do they make women feel and function better? Both halves of that question matter, because an anatomical change that brings no functional benefit is a very different result from one that does.

The authors systematically searched for randomised controlled trials published before August 2025 that compared structured exercise programmes against no treatment or standard care in postpartum women with diastasis recti. Nine trials with 450 participants provided data on the primary outcome, the inter-recti distance, which is the measured width of the gap between the two abdominal muscles. Physical disability was assessed as a secondary outcome using the Oswestry Disability Index, drawing on three comparisons from two trials involving 115 women. The team also rated the methodological quality of the included trials and the certainty of the evidence using standard tools.

Exercise reduced the inter-recti distance by 8.05 mm on average compared with control conditions. Programmes started within 3 months of giving birth achieved a larger reduction, 10.2 mm, than those started later. Notably, no particular type of training proved superior to any other; the consistent advantage was for doing a structured programme versus not doing one. On function, the picture was different: disability scores on the Oswestry index showed no significant difference between exercise and control groups, with the exercise groups scoring 0.82 points higher on average, a difference that could easily be chance.

This pooled analysis strengthens the case that conservative management genuinely changes the anatomy of diastasis recti, which has been contested. At the same time it complicates the story, because the narrower gap did not translate into better function on the scale used, at least within the periods the trials observed. The authors suggest the field may need disability measures designed specifically for this condition, since a back-pain questionnaire may miss what matters to these women. Optimal protocols, timing windows and programme content all remain open questions.

For anyone weighing up what to do about a post-pregnancy ab gap, this is a reason to think structured exercise can measurably narrow it, and that an earlier start may narrow it more. It is also a reason not to agonise over which specific programme to follow, since no type of training stood out from the rest. The honest flip side is that the measured benefit here is anatomical: the trials could not show that women felt less disabled afterwards. Knowing both halves of that result is useful before deciding what success would look like for you.