Do U.S. Soccer Coaches Unintentionally Stifle Attacking Creativity By Teaching "Good Passing" to Mean "Passing to Feet" Instead of "Passing to Space"?
Two other games that can teach your players to be aggressive are "Defend The Goal & Clear Game" and "Corner Kick Simulation" (these 2 also teach some other useful things).
If a player has used incorrect passing technique for several years, it is difficult to correct.
Teaching Soccer players to be aggressive about winning the ball.
A player who is slow and has weak ball skills can be a good defender if he is brave (i.e., not afraid of contact) and you "defend deep" and teach him how to clear the ball and a simple zone defense.
Your players will have a lot more confidence and will play with more enthusiasm if they know they can dribble and protect the ball.