What the linea alba separation actually is
Diastasis recti is a widening of the gap between the left and right halves of the rectus abdominis at the linea alba, the connective-tissue seam down the midline. It is extremely common in late pregnancy as the growing uterus stretches the abdominal wall, and it can also occur with significant weight gain or repeated high intra-abdominal pressure. The key issue is less the width of the gap and more whether the tissue can generate tension to transfer load across the midline.
Many cases narrow naturally in the months after birth. A persistent gap is common and is not by itself dangerous, though it can affect core function and appearance.
Rebuilding tension rather than crunching
Rehabilitation focuses on restoring coordinated function of the deep core: diaphragmatic breathing, gentle transversus abdominis and pelvic floor engagement, and gradually progressing to loaded work that the tissue can manage without doming or bulging along the midline. Aggressive crunches and exercises that cause the belly to push out are usually deprioritized early because they can load the midline before it is ready, though tolerance varies.
This is general educational information, not medical advice. Assessment and a tailored program from a pelvic-health physiotherapist or physician are recommended, particularly postpartum or if there is pain, hernia, or pelvic-floor symptoms.