Advanced form of warm up. Start with 6v4.
Progression: 6v6, team in possession have set seconds to pass at one corner. The coach could allow them to gain more seconds when they send the ball to a mate in one corner who can still make a short pass to a mate in his zone. This is allowed for 2 times. When they make the 3rd pass to their own corner, they have to long pass the ball to the other field. Otherwise, the points deducted.
Defenders, press higher and mark the edges of those cornered boxes.
THE FOUR CORNERSTechnical/Tactical: