Of course the image below is of someone in a seated yoga twist but look more closely at the creases in the person's top.
What you see is not dissimilar to what the body is experiencing behind this garment. Yoga twisting is a bit like wringing out a damp cloth.
The muscles and soft tissue contort a little to allow for the positioning. The challenging thing for the body is that it presents the diaphragm and other muscles of respiration with a resticted feeling when breathing and more especially when breathing in. This may feel a little uncomfortable but it can provide us with something useful.
When putting the torso in this contorted position if we pay closer attention to our breathing and breath slowly and evenly it can neutralize the tension but also massage and tone the muscles and tissue in that area to our advantage.
It doesn't stop there. It is really worth exploring a number of postures including those you already use in your practice to check if they too require their own kind of contortion (different to that found in twisting) so asking questions of the diaphragm.
This approach makes for greater awareness and concentration when in posture and if we use our breath in a massaging way can bring added toning and even more strength to those muscles and tissue.
As an example next time you do a Downward Facing Dog notice the breath, one thing you will notice is that you are breathing up hill!
Yoga Teacher Mind and Body