This shows the area defenders should primarily be responsible for in a 7v7 formation with 2 defenders.  Primary role is to slow the attack in the middle of the field and force attackers wide. Stay in front of the ball or with your man. Defenders should rarely be more than 10-15 yards away from each other.  3 key principles of defense - Pressure-Posture-Patience - once defender has won the ball, look to play to a wide teammates feet or if under significant pressure clear the ball deep and wide. Defenders should push up to the midfield line when the ball is in the attacking side of the field.