cutoff for men is 165.0 lb. and 135.0 lb. for women. In the spring season (typically sprint races), the lightweight cutoff for men is 160.0 lb., with a boat average of 155.0 lb. for the crew; for women, the lightweight cutoff is 130.0 lb. For juniors in the United States, the lightweight cutoff for men is 150.0 lb.; for women, it is 130.0 lb. In the fall the weight limits are increased for women, with the cutoff being 135 lb. Pararowing Adaptive rowing is a special category of races for those with physical disabilities. Under World Rowing rules there are 5 boat classes for adaptive rowers; mixed (2 men and 2 women plus cox) LTA (Legs, Trunk, Arms), mixed intellectual disability (2 men and 2 women plus cox) LTA (Legs, Trunk, Arms), mixed (1 man and 1 woman) TA (Trunk and Arms), and men's and women's AS (Arms and Shoulders). Events are held at the World Rowing Championships and were also held at the 2008 Summer Paralympics. Governing bodies The World Rowing Federation, known as FISA until recently, is the sport's international governing body. World Rowing runs the World Rowing Championships, as well as several other international elite competitions including the World Rowing Cup and World Rowing Junior Championships. World Rowing also sponsors rowing at the Olympics. World Rowing has over 155 national member federations who govern the sport in their respective nations. International competitions The Olympic Games are held every four years, where only select boat classes are raced (14 in total): Men: quad scull, double scull, single scull, eight, coxless four, and coxless pair Lightweight Men: double scull Women: quad scull, double scull, single scull, eight, coxless four, and coxless pair Lightweight Women: double scull At the end of each year, the FISA holds the World Rowing Championships with events in 22 different boat classes. Athletes generally consider the Olympic classes to be premier events. In 2017 FISA voted to adopt a new Olympic programme for 2020, whereby the lightweight men's coxless four event was replaced by the women's heavyweight coxless four. This was done to ensure that rowing had a gender equal Olympic programme. During Olympic years only non-Olympic boats compete at the World Championships. Fitness and health Rowing is one of the few bearing sports that exercises all the major muscle groups, including quads, biceps, triceps, lats, glutes and abdominal muscles. The sport also improves cardiovascular