Being at every workout and team practice to do the number of repetitions necessary to develop the skill and understanding each other as a team.
If a player is not in condition, he cannot practice at the speed that is effective and improve his skills. He will not perform at his best for the complete game.
Intentionally practicing with game-like intensity and execution will prepare you and the team for predicable success during the game. Leading by example will motivate teammates to do the same.