Navel Defense System (“Belly D”): A defensive move, whereby one player lifts his shirt to expose a bare midriff in the line of sight of an opposing player who is attempting a field goal. The objective is to distract the shooter and cause him to miss a shot. Fair-skinned defenders emit particularly glaring white light from the belly area, which can only worsen conditions for the shooter, although other factors such as belly size may also add potency to this strategy. While flashing as described, the defender may run toward the shooter for effect, or simply stand in place, if already properly positioned. In some cultures it has become customary to shout “Belly D!” in order to draw additional attention, but this is not a requirement.