roller sport
sport that use human powered vehicles using rolling either by gravity or various pushing techniques
skateboarding
action sport on skateboards
roller skating
sport, activity, or form of transportation involving shoes with small wheels attached to the soles
freestyle scootering
extreme sport
inline skating
multi-disciplinary sport using inline skates
roller derby
contact sport on roller skates
Freestyle slalom skating
skating that involves performing tricks around a straight line of cones
roller hockey (quad)
ballgame and team sport