Balls Out! Sports, LLC

If you wanted to play soccer, you could join a traditional soccer league. Or you could sign up for Balls Out! Sports, which shimmies its players into giant, clear, inflatable spheres. Once inside, players bounce off of one another, tuck their legs and roll down the field, or run upright while kicking the ball toward the goal. The result: fun-filled games that boost one's cardiovascular system through both running and laughing.