Clear a big area in your classroom and divide your students into two teams. Put a line of chairs down the middle of the classroom to divide it into two halves.
Have your students spread out on each side of the 'net' like two volleyball teams.
Get a balloon and throw the balloon to one team. Whenever a student hits the balloon, they must say a word from a topic you give.
The object is for teams to score a point by the balloon touching the floor on the opposing team's side. Students cannot move their feet and must stay planted on the floor.
The first team to ten points is the winner! If a student hits the balloon without saying a word, then they lost a point. Change topics often and have fun!