Rowing was included in Olympic sport in 1896 at the first modern Olympic Games. If the weather is bad, those events had to be cancelled. Rowing boats used to be made of wood. Today they are made of plastic or fiberglass. They can be 23.5 inches to 24.5 cm wide and 9 yards to 21 yards long. The boats weight between 39 and 211 lbs.The rowers are also divided into categories by weight. There are two categories of boats in the Olympic games and there will be races for both men and women. In Sculling event the athletes hold two oars, one oar in each hand. It consist of single scull - one rower, double sculls - two rowers, quadruple sculls - four rowers, lightweight double sculls. In Sweep rowing the athletes use both hands on one oar. It is played pair, four, eight or lightweight four men. Rowing races cover a distance of 1.25 miles in a river, canal or lake.