Switcheroo

Each player has a ball.  Players dribble around in a grid and listen for the coach to shout out a word.  When that word is yelled out the players have to stop their ball, and then run to another ball.  Once the players get the hang of it, the coach could yell out different body parts (elbow, forehead, bottom, etc.).  The players then have to stop the ball with that body part and then move to a different ball.  Once getting to the new ball the players start dribbling around right away until they hear the word shout out.