This shot from one of Veronica Valentyne's videos shows one of the most spectacular naulis I have ever seen, from the side. The indentation behind her central abs is so deep, it looks as if the skin is touching behind the muscles. She is not a big woman, but her abs show strong muscularity and, certainly, tremendous skill at controlling them!
This shot shows Veronica's abs from the side while lying down with perfect lighting. Again, it shows a very deep indentation behind her central abdominal muscles when he abs are vacuumed on either side. The effect is spectacular.
That trap flexing is so hot, love the way it bunches up.