This tactics session for the 9v9 game splits the pitch into three parts so players can see which corridor they should go in when in or out of possession with a 6v6 game to help focus the idea
On a tactics board show players the three ‘corridors’ That they should think about when attacking or defening.
Spend some time explaining that when out of possession look to defend in two corridors in relation to the position of the ball and when in possession use all three corridors.
Use the 6v6 small-sided game to cement the ideas and look for your players using the tactic to defend and attack much better.