Defence
Pressure
This determines how high your team will press up the pitch
1-32 Stay back
33-66 Press till the middle line
67-99 Press as much as you can
Aggression
How aggressive your player will be when the opponent has the ball
1-32 Not charging in on the player, containing
33-66 Close in to the player
67-99 Double charge in on the player, very aggressive
If you set pressure and aggression very low ( < 25 ), your defence will stay very deep.
This is very helpful against people who only play lobbed through balls, since they will be much less effective if your defence is playing this deep.