One player must be the referee and know how to use the stopwatch. Players must determine a set number of throws. 5 throws is a good suggestion. The first player throws the ball in the air as high as possible and has the referee see how many seconds it stays in the air. The referee must then record how many seconds it stayed in the air. Then other players each take their turn in order. After all throws are done, add up the seconds for each player. The player with the most seconds wins.