Freestyle swimming, also known as front crawl, is the fastest and most efficient of the swimming strokes used in competition. It is the most common stroke used in freestyle competitions. During a race, the competitor circles the arms forward in alternation, kicking the feet up and down (flutter kick). The freestyle stroke is swum in a horizontal position with the body facing down. The body rolls from one side to the other, always turning to the side of the arm that is currently pulling in the water. The head remains in a neutral position, face down, except when breathing. To enable breathing, the body rolls a little further to the side during the arm recovery, and the head also turns to the side until the mouth is above the water surface. The arms execute alternating movements, with one arm moving and pulling underwater from an extended forward position to the hip, while the other arm recovers above water from the hip to the extended forward position. Once this is done, the arms switch roles, such that each arm pulls and recovers once over the entire stroke cycle. The freestyle stroke is not limited to the front crawl, and swimmers have the freedom to choose other styles, such as the sidestroke and dog paddle. However, the front crawl is still the most well-used technique in freestyle competitions because it combines speed and efficiency well.