Too many "G.I. Joe" type pics floating around, where the shooter's body splays off at an angle to the rifle.
Appleseed teaches that you should be “splayed off at an angle” and for me anyhow, it works better then making your body a straight line with the bore. Being at an angle, some where around 15 to 25 degrees from the bore axis, is less fatiguing, thus more comfortable, and you can shoot longer. Angling from the bore rather then straight lining it, also feels more natural. But to each his own I guess.