rolls are more or less useful in different situations. One key to all rolls is that the head comes out of the water last, following the paddler's torso—not first, which presents a non-hydrodynamic profile and tends to oppose the angular momentum which is the hallmark of a successful roll. Thirty-five different types of roll and related maneuvers are performed at the Greenland Kayaking Championships. Different rolls have different purposes, such as righting the kayak if the arms are entangled or injured, if the paddle is lost, if the akuilisaq has come off or is not worn, or if the kayaker has to keep hold of something (in competition, an inflated avataq or an eight-kilogram weight), A) Hip-Flick Rolls： As mentioned above, Hip-Flick Rolls are a category of kayak rolls that engage Hip-Flick to produce rotational force to right a capsized kayak. Screw roll This is the main roll that is usually taught to beginners first and is often what is referred to as "the roll". It is good on open or flat water but requires a reasonably large area to perform well so can be less useful in tight spaces or on whitewater. C-to-C roll The C-to-C roll is another common roll that tends to be used more on whitewater. The name was inspired by the two curved shapes adopted by the body during the roll. Reverse Screw roll (a.k.a. "Back Deck Roll") As the name suggests this is similar to the screw roll but performed in reverse, it is often used in playboating or in general when the paddler goes over whilst on the back deck. In this scenario it is far quicker to perform this roll than to move the paddle into a set-up position for a more standard roll. The disadvantage of this roll is that it leaves the face exposed and poses some risk to the shoulder. Hand roll This roll is a bit of a 'party trick' but can also be useful if the paddler has lost their paddle and is also useful in the game of canoe polo. It relies heavily on the hip-flick. It is also frequently used by paddlers who run big waterfalls, as landing at high speed without a paddle is considered to pose less risk than landing with a paddle. Tallit paarlatsillugit timaannarmik (body roll, no-hand roll) Rolling up without a paddle, with the arms crossed against the chest throughout.