Hoover-ball was played by teams of 2-4 players with a six-pound medicine ball over a net eight feet high on a court similar to one used for tennis. The game was scored exactly like tennis, and played in similar fashion. The server throws the ball. The opponent must catch it on the fly and immediately return it, attempting to put it where it cannot be reached and returned. The side that misses the ball or throws it out of bounds loses the point.

"Stopping a six-pound ball with steam back of it, returning it with similar steam, is not pink-tea stuff," DuPuy wrote. "Dr. Boone estimates that as much beneficial exercise is obtained from half an hour of it (Hoover-ball) as from three times as much tennis or six times as much golf." 

Rules