There are three different defending schools in football, old-fashioned man marking with the libero, which has faded away, the second is mixed zone or the modern man marking that aims for individual duels across the field, the player pays attention primarily on the direct opponent and mark the man within the zone. The third is zonal marking, where players assigned into a specific zone, and move with respect of the position of the ball, goal, teammate and the opponent. The basic principle is to defend the zone of the ball and shorten the playing field to limit the space of the opponent. A team keep short distance vertically and horizontally between its lines, moving collectively according to the ball position, advancing forward, slipping backwards, and shifting from side to the other and so on in order to maintain spatial coverage. Defenders have to keep an eye to the neighboring areas and maintain constan...