Ab Complete the general rules. If necessary, go back to 4a to check your answers. 1 If there is a (kind of) ball involved and it is competitive, you usually use the verb e.g. rugby, football. 2 If you do the sport indoors, then you usually use the verb e.g. gymnastics, yoga. 3 If the sport is generally played outside, then you usually use the verb. . Most of these sports end in -ing, e.g. fishing, horse-riding.​