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Boating activities are as varied as the boats and boaters who participate, and new ways of enjoying the water are constantly being discovered. Broad categories include the following: Paddlesports include ears (lakes), swiftwater (rivers), and oceangoing types, usually covered-cockpit kayaks. Canoes are popular on lakes and rivers due to their carrying capacity and efficiency on the water. They are also easy to portage, or carry overland around obstructions like rapids, or just down to the water from a car or cabin. Kayaks can be found on calm inland waters, whitewater rivers, and along the coasts in the oceans. Known for their maneuverability and seaworthiness, kayaks take many shapes depending on their desired use. Rowing craft are also popular for fishing, as a tender to a larger vessel, or as a competitive sport. Rowing shells are extremely long and narrow, and are intended to convert as much of the rower's muscle power as possible into speed. The ratio of length of waterline to beam has much importance in marine mechanics and design.. Row boats or dinghies are oar powered, and generally restricted to protected waters. Rowboats are generally heavy craft compared to other has Sailing can be either competitive, as in collegiate dinghy racing, or purely recreational as when sailing on a lake with family or friends. Small sailboats are commonly made from fiberglass, and will have wood, aluminum, or carbon-fiber spars, and generally a sloop rig (two sails: a mainsail and a jib, commonly include 3rd sail the spinnaker for going downwind). Racing dinghies and skiffs tend to be lighter, have more sail area, and may use a trapeze to allow one or both crewmembers to suspend themselves over the water for additional stability. Daysailers tend to be wider across the beam and have greater accommodation space at the expense of speed. Cruising sailboats have more width, but performance climbs as they tend to be much longer with a starting over-all length of at least 25 feet (8 m) re-balancing the dynamic ratio between length of waterline (aiding speed) and beam width (adding cargo and people space). Freshwater fishing boats account for approximately 1/3 of all registered boats in the U.S., and most all other types of boats end up being used as fishing boats on occasion. The boating industry has developed freshwater fishing boat designs that are species-specific to allow anglers the greatest advantage when fishing for walleye, salmon, trout, bass, etcetera, as well as generic fishing craft. Watersport Boats or skiboats are high-powered Go-Fast boats (specialized towboats in fact) is designed for activities where a participant is towed behind the boat such as waterskiing and parasailing. Variations on the ubiqutous waterski include wakeboards, water-skiing, kneeboarding, inflatable towables, and wake surfing. To some degree, the nature of these boating activities influences boat design. Waterski boats are intended to hold a precise course at an accurate speed with a flat wake for slalom skiing runs. Wakeboard boats run at slower speeds, and have various methods including ballast and negative lift foils to force the stern in the water, thereby creating a large and "jumpable" wake. Saltwater fishing boats vary widely in length and are once again specialized for various species of fish. Flats boats, for example, are used in protected, shallow waters, and have shallow draft. Sportfishing boats range from 25 to 80 feet (8 to 24 m) or more, and can be powered by large outboard engines or inboard diesels. Fishing boats in colder climates may have more space dedicated to cuddy cabins and wheelhouses, while boats in warmer climates are likely to be entirely open. Cruising boats applies to both power and sailboats, and refers to trips from local weekend passages to lengthy voyages, and is a lifestyle. While faster "express cruisers" can be used for multiple day trips, long voyages generally require a slower displacement boat (trawler) with diesel power.