Roller sports are sports that use human powered vehicles which use rolling either by gravity or various pushing techniques. Typically ball bearings and polyurethane wheels are used for momentum and traction respectively, and attached to devices or vehicles that the roller puts his weight on. The international governing body is World Skate. List Roller sports include the following disciplines Inline skating Vert Skating Aggressive inline skating Inline freestyle skating Inline figure skating Inline hockey Inline skater hockey Inline speed skating Roller soccer Inline alpine skating Roller skating Artistic roller skating Roller speed skating Drafting Jam skating Roller derby Rink hockey Road skating Roller skiing Dry ski slope Grass skiing Indoor ski slope Roller cross-country skiing Roller alpine skiing Skateboarding Freestyle skateboarding Skateboarding trick Street skateboarding Park skateboarding Freestyle scootering World Roller Games disciplines Since 2017 World Skate has organised the World Roller Games, a biennial competition that now includes 11 world championships in one single event. List of events: Alpine Skating Artistic roller skating Downhill Skateboarding Inline Freestyle Inline Hockey Rink Hockey Roller Derby Roller Freestyle Skateboarding Inline speed skating Olympic Disciplines Skateboarding events have been introduced for the 2020 Summer Olympics, with two events: park and street. Much like BMX cycling, the park event will feature what resembles an empty swimming pool. Competitors will have three timed runs for tricks. On street, there will be ramps and rails for routines and tricks. There will be a total of 80 total spots, with 20 in each event. Each country can enter a maximum of three athletes in each event. World Games Disciplines On the programme for the 2021 World Games to be held in Birmingham, Alabama there are 4 roller sports disciplines; Artistic, Inline hockey, Speed Skating Road and Speed Skating track. Roller sports is the only sport on the World Games programme represented in three clusters. Speed Skating belongs to "Trend Sports", Artistic to "Artistic Sports" and Inline Hockey to "Ball Sports". References External links Sports by type