Diastasis rectus abdominis (DRA) is defined as an excessive separation between the two abdominal rectus muscles. It is generally quantified by the inter-recti distance. In postpartum women, the prevalence of diastasis is 60% six weeks after delivery.

The increase in the inter-recti distance has been associated with a decrease in strength and endurance of the trunk flexors and rotators (p < 0.05). Exercise during pregnancy has been shown to be helpful in the treatment of DRA. Nevertheless, there is still not strong evidence to establish what kind of exercise should be recommended during pregnancy and in postpartum.

The aim of this study is to compare the morphological and functional changes of the linea alba during four exercises.

Inter-recti distance, linea alba thickness and distortion index will be measured at rest, as well as during 4 exercises (draw in maneuver, crunch, pelvic floor muscle contraction and a "de Gasquet" exercise). Subgroup analysis will be performed to determine if the presence or absence of an abdominal diastasis has an influence on these outcomes.

A cross-sectional pilot study will be carried out. The main outcome measure will the inter-recti distance. Secondary outcomes will be the thickness of linea alba and distortion index.

Inclusion Criteria:

• Adults
• Parous
• Women
• Accepting to participe in the research

Exclusion Criteria:

• Under curatorship
• Persons deprived of their liberty by judicial or administrative decision
• Having intellectual limitations that may limit the understanding of questionnaires or exercises
• With limitations in understanding the French language
• Pregnant women
• History of pelvic / spine fractures
• History of pelvic surgery
• History of spinal surgery
• History of abdominal surgery
• History of lower limbs weakness, changes in osteotendinous reflexes or loss of sensitivity

Adult parous women attending to several physiotherapy centers in Paris will be recruited