The coach is on the other side of the area with two different colored cones (e.g., green and red).
The coach shouts "Green!" with their back turned to the players, and the players are allowed to dribble.
The coach shouts "Red!" and turns around after two seconds to look at the players' balls. The players' goal is to dribble the ball in a way that the coach cannot see the ball moving. Players themselves are allowed to move in front of the coach.
If the coach sees the ball moving, the player dribbling that ball must return to the starting point.
The winner and possibly the new "traffic light" is the player who first crosses the goal line at the other end.
This can also be implemented so that the "traffic light" only shows the colors, e.g., by raising a certain colored cone in the air and then turning around.
Quality factors
Players must control the ball with small, soft touches so they can stop it quickly.
Quick stopping and starting movement.
Observing the coach.
Key questions
What is the best way to stop the ball as quickly as possible?
What happens if you keep your eyes only on the ball and don't follow the coach's movements?