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.
Street football (American)
An organized version has seven players to a side, such as in the American 7's Football league (A7FL); however, such organization is rare, players per side can range from as few as one ("one on one" football) playing both sides of the ball to dozens. Games are played on fields generally ranging from as short as 10 to as large as 50 yards, with the occasional game being played on a full-size regulation 100 yard field such as in the A7FL. Generally, the larger the field, the more players that can be incorporated into the game. The A7FL plays on a full-size regulation field in regards to length, however, the width of the field is shortened, from approximately 50 yards, to 40 yards in order to accommodate fewer players on the field.