Sausage feeling

So after hearing sifu describe the "sausage feeling" I went scattering through anatomy pics and came across the transverse abdominis (TA) sheath. It runs down the front of the abdomen and the rectus abdominis is engaged within it. My thought is that when we release the tissues and the stabilizers are properly activated the TA pulls the sheath tight and we can feel all of the fascia around the rectus pull against the front of the TA.