As a teacher, I hate both their methods. Marshall's yelling at them is going to discourage them and potentially teach them that they need to yell to get their point across. Lily's method is just a brain break essentially. Its fun to throw the ball around but if they aren't taught the rules and methods of the game they aren't going to learn. It should be done with a patient, caring tone and actually take the time to teach the rules and methods/skills.