In my opinion, if someone believes they are training for real world self defense, and only trains from a standing position, they are living in a fantasy world. If you only train sitting, and on the ground once-in-awhile, then you need more balance for Reality Self Defense.
Sitting in chair, in a restaurant booth, in a movie theater, at a bowling alley, on a bar stool, in the bleachers at a sporting event, on a bus, in your car (driver's seat, passenger's side, back seat, trunk), all of these scenarios must be duplicated, and practiced often. This is the real world environment where you are going to apply those skills you've been learning in the neat, padded, uncluttered training hall.
Grappling while lying down is good practice, but then move it to an elevated bed (where women are often attacked at home) with side tables, lamps, and other obstacles (don't practice around breakable items, but duplicate the environment with similar non-breakable props). What about in the bathtub, or shower (home, health club, college dorm)? How much room do you have to move? What type of techniques will you use? Will you slip on the wet, soapy floor? Will you automatically go to the ground to prevent an accidental fall?
In addition to positions (standing, sitting, lying), and environment (chairs, tables, beds, bathtubs), what about other conditions? What about when your tired after a long workout, or groggy if you were just woken up by an intruder as you slept? What about if you just came indoors from a bright sunny day (pupils shrunken), or are walking outside into the bright sun (eyes dilated from the dark room)? What about if your hands are tied, taped, or hand-cuffed? Fighting indoors, outdoors, when its quiet, where it is noisy, when your are dressed in street clothes, swim-wear, or naked (I'm in for that class :ultracool )! How much real-life training do you do????
This is an every day thing at my school (not the nude class, I reserve that for my wife's training!). No sense learning the Martial Art if you are not also learning when, where, and how to apply it in any circumstances.
CM D.J. Eisenhart