Things to remember in defending

Once the Defender is in position goal side of the ball , the Defender must think about his/her line of recovery , marking and challenging an opponent. The Defender has 5 options.
1. Track an Attacker who is making a run to the back of the defense .
2. Occupy important space goal side of the ball .
3. Mark an Attacker in the area of the ball.
4. Cover a teammate who is challenging the Attacker with the ball.
5. Challenge the Attacker with the ball.