Tennis polo
The sport is played on a grass field between 80 and 100 yards long and 50 to 65 yards wide. The goal area is a semicircular line with an 11-yard radius and the penalty mark at 13 yards from the goal. An experimental rule has a second semicircular line on the field with a 17-yard radius. Generally, a field for gridiron football or soccer can be used.
Speedball (American ball game)
The field can be any number of sizes and locations but the earliest variants were generally played on a basketball court or on a soccer field. The size of the goal should be about 6 ft wide by 2.5 ft tall. However, different size and types of goals can be used; the larger the goals, the faster the game generally goes. Hockey goals are also commonly used. A soccer ball, football, rugby ball, or volleyball may be used.