Dribble flat out across the grid, then add cones to dodge without touching them.
Part 1
Dribble from one side to the other. Go as fast as they can, focusing on going straight and keeping the ball in front of them. For U6, get them dribbling under control with laces. Do this a few times, back and forth.
Part 2
Put down some cones and have the kids avoid them, trying to keep the ball off the cones. This forces more control instead of just going in a straight line.