Yes orchid it is.
i have the advantage of having some one to direct me when it comes to posture and the like. In addition to being a "dancer" with the training it intails/I also practice my positions and movements infront of a mirror especially transitions. Weather or not ones tummy is tucked as well as other things is of course up to the individual doms delight.
I keep my back striaght or arched slightly. When i walk it is to be done not for efficiencey's sake so much as a display, short steps with slightly overt hip movements. If i run it is stiff legged when done for presentation purposes, simular to a ballerina. This disipline is of course modified when i am excersiseing or working but never fully relaxed. Even when lounging around on the couch while my owner sits in his throne (his lazyboy lol) I keep in mind his eyes are upon me.
Most girls are not aware of thier posture and have thier shoulders very relaxed and slumped foreward. My shoulders are to be rolled back, my chin slightly tucked in an erect and apealing posture.
For instance while sitting at this chair, my back is slightly arched, arms bent at the elbows, fingers poised over the keyboard, head up, sitting foreward on the seat so my back isnt resting on the chair, my knees spread and only the balls of my feet resting on the floor, with my tummy flat or slightly tucked, my chest slightly out. If my owner were to pass by and look in or is likely too, or i am just practicing my posture, this how i would be. Now in front of other people or other situations it is modified somewhat to be more "prim" and proper as the case may be