The different types of sports around the world can be grouped according to their main characteristics. Thus, the approximately 250 officially recognized sports can be divided based on the surface ...

Originally, these sports were wild and loose with few rules ... There are two primary types of cross-country skiing: skate and classic. In classic, skiers push their skis straight ahead.

Background Elite athletes' injuries are multi-factorial and sport specific. However, the inter-relationships between sport type characteristics and injury types and related variables are not clear.