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This just adds reenforcement to my training. I like to take a tarp with me when I go shooting. I'll lay it down on the ground and and practice shooting laying on my side and back with strong and support hands. Another position is it lay on your back with your head towards the target. You'll end up holding your pistol and looking at the target upside down.
These various positions help simulate you having been pushed down to the ground, fallen, etc. Everyone should try to get away from the square range once in awhile and practice some situations that you may encounter. One should also practice getting off of the X. Stand and deliver will only result in you getting hurt. Not only does getting off of the X make you a harder to hit moving target but will also throw the attackers OODA loop off.