Shooting competition is NOT the same as trying to save your life. An individual would have to be incredibly STUPID to not carefully heed the comments made by SeanM, a guy coming from a similar background as Kyle Lamb and Larry Vickers referenced above, and clearly the person in this thread with the most experience using lethal force in a dynamic environment:
Likewise, someone would have to be very ignorant or insolent to ignore the hard won experience and advice from highly experienced LE officers like Nyeti, Wayne Dobbs, and tpd223."Leaning forward or aggressive forward lean, or whatever you choose to call it, or how you choose to describe it may or may not affect your shooting. If you strictly play games with guns, then no problem. But away from the game, having an aggressive stance, while slightly fatiguing, will pay dividends."