A new research proves that to a notable degree, the abs (rectus abdominus, the 6 pack muscle) can in fact hypertrophy from repetitive abs training including Pilates. It could be either good or bad depending on preference and physique goals, but some women should be aware of that regardless if they want a flat tummy while avoiding a 6-pack.

It’s also worth noting that from a functional point of view, Pilates can help you remove imbalances in the core as well as the abdominal muscles.

read more about it here