The Paralympic Games is held every four years and includes rowing. It was introduced into the Paralympic programme in 2005 and at the Beijing 2008 Paralympic Games it was held for the first time. The London 2012 Paralympic Games had 23 countries competing in Para-rowing for 12 medals in four boat classes. The four boat classes are AS men's single sculls, AS women's single sculls, TA mixed double sculls, and LTA mixed coxed fours. Races are held over 1000 metres for all four events.