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The front crawl or forward crawl is a swimming stroke usually regarded as the fastest of the four front primary strokes. As such, the front crawl stroke is nearly universally used during a freestyle swimming competition, hence freestyle is used metonymically for the front crawl. It is one of two long axis strokes, the other one being the backstroke. Unlike the backstroke, the butterfly stroke, and the breaststroke, the front crawl is not regulated by the FINA. This style is sometimes referred to as the Australian crawl or the American crawl, although these can refer to more specific variants of front crawl.
The face-down swimming position allows for a good range of motion of the arm in the water, as compared to the backstroke, where the hands cannot be moved easily along the back of the spine. The above-water recovery of the stroke reduces drag, compared to the underwater recovery of breaststroke. The alternating arms also allows some rolling movement of the body for an easier recovery compared to, for example, butterfly. Finally, the alternating arm stroke makes for a relatively constant speed throughout the cycle.
The front crawl has been in use since ancient times. In the Western world, the front crawl was first seen in a swimming race held in 1844 in London, where it was swum by Native North Americans, who easily defeated all the British breaststroke swimmers. However, the English gentlemen considered this style, with its considerable splashing, to be barbarically "un-European". The British continued to swim only the breaststroke in competition.
Sometime between 1870 and 1890, John Arthur Trudgen learned the front crawl from native South Americans during a trip to Argentina (the exact date is disputed, but is most often given as 1873). However, Trudgen mistakenly used (in Great Britain) the more common sidestroke (scissor) kick instead of the flutter kick used by the Native Americans. This hybrid stroke was called the Trudgen stroke. Because of its speed, this stroke quickly became popular.
Trudgen's style was improved by the Australian champion swimmer, Richmond "Dick" Cavill (1884–1938), the son of the swimming instructor, "Professor" Richard "Frederick" Cavill. While Richmond and his brother "Tums" developed the stroke, they were later inspired by Alick Wickham, a young Solomon Islander who was living in Sydney. He swam a version of the crawl stroke that was popular in his home island at Roviana lagoon. They modified their swimming stroke using this as inspiration and this modified Trudgen stroke became known as the "Australian crawl".
The American swimmer Charles Daniels made modifications to a six-beat kick, thereby creating the "American crawl". With minor modifications, this stroke is the front crawl that is used today.
The starting position for front crawl is known as the "streamline" position. The swimmer starts on the stomach with both arms stretched out to the front and both legs extended to the back.
The arm movements of the front crawl provide most of the forward motion. The arms alternate from side to side, so while one arm is pulling and pushing under the water, the other arm is recovering above the water. The move can be separated into three parts: the downsweep, the insweep and the upsweep. Each complete arm movement is referred to as a stroke; one stroke with each arms forms a stroke cycle. 
From the initial position, the arm sinks slightly lower and the palm of the hand turns 45 degrees with the thumb side of the palm towards the bottom, to catch the water and prepare for the pull. The pull movement follows a semicircle, with the elbow higher than the hand, and the hand pointing towards the body center and downward. The semicircle ends in front of the chest at the beginning of the ribcage.
The push pushes the palm backward through the water underneath the body at the beginning and at the side of the body at the end of the push.
This pull and push is also known as the S-curve.
Some time after the beginning of the pull, the other arm begins its recovery. The recovery moves the elbow in a semicircle in a vertical plane in the swimming direction. The lower arm and the hand are completely relaxed and hang down from the elbow close to the water surface and close to the swimmer's body. The beginning of the recovery looks similar to pulling the hand out of the back pocket of a pair of pants, with the small finger upwards. Further into the recovery phase, the hand movement has been compared to pulling up a center zip on a wetsuit. The recovering hand moves forward, with the fingers trailing downward, just above the surface of the water. In the middle of the recovery one shoulder is rotated forward into the air while the other is pointing backwards to avoid drag due to the large frontal area which at this specific time is not covered by the arm. To rotate the shoulder, some twist their torso while others also rotate everything down to their feet.
Beginners often make the mistake of not relaxing the arm during the recovery and of moving the hand too high and too far away from the body, in some cases even higher than the elbow. In these cases, drag and incidental muscle effort is increased at the expense of speed. Beginners often forget to use their shoulders to let the hand enter as far forward as possible. Some say the hand should enter the water thumb first, reducing drag through possible turbulence, others say the middle finger is first with the hand precisely bent down, giving thrust right from the start. At the beginning of the pull, the hand acts like a wing and is moved slower than the swimmer while at the end it acts like an oar and is moved faster than the swimmer.
There are several kicks that can be used with the upper body action of the front crawl. Because the front crawl is most commonly used in freestyle competitions, all of these kicks are legal.
The most usual leg movement with the front crawl is called the flutter kick. The legs move alternately, with one leg kicking downward while the other leg moves upward. While the legs provide only a small part of the overall speed, they are important to stabilize the body position. This lack of balance is apparent when using a pull buoy to neutralize the leg action.
The leg in the initial position bends very slightly at the knees, and then kicks the lower leg and the foot downwards similar to kicking a football. The legs may be bent inward (or occasionally outward) slightly. After the kick, the straight leg moves back up. A frequent mistake of beginners is to bend the legs too much or to kick too much out of the water.
Ideally, there are 6 kicks per cycle (the stroke so performed is called the American crawl), although it is also possible to use 8, 4, or even 2 kicks; Franziska van Almsick, for example, swam very successfully with 4 kicks per cycle. When one arm is pushed down, the opposite leg needs to do a downward kick also, to fix the body orientation, because this happens shortly after the body rotation.
Using the whip kick (from the breaststroke) with front crawl arms is called the Trudgen (after its inventor, Englishman John Trudgen), or the racing stroke; this was the original form of the front crawl and can still sometimes be seen. It is a difficult stroke to master, as the breathing pattern for front crawl needs a rotation, and a breaststroke kick resists this rotation. It is also possible to employ a dolphin kick, as used in the butterfly stroke; although this reduces the stability of the swimming position, it has been used by swimmers Michael Klim and Alex Popov at the Olympic Games.
Normally, the face is in the water during front crawl with eyes looking at the lower part of the wall in front of the pool, with the waterline between the brow line and the hairline. Breaths are taken through the mouth by turning the head to the side of a recovering arm at the beginning of the recovery, and breathing in the triangle between the upper arm, lower arm, and the waterline. The swimmer's forward movement will cause a bow wave with a trough in the water surface near the ears. After turning the head, a breath can be taken in this trough without the need to move the mouth above the average water surface. A thin film of water running down the head can be blown away just before the intake. The head is rotated back at the end of the recovery and points down and forward again when the recovered hand enters the water. The swimmer breathes out through mouth and nose until the next breath. Breathing out through the nose may help to prevent water from entering the nose. Swimmers with allergies exacerbated by time in the pool should not expect exhaling through the nose to completely prevent intranasal irritation.
Standard swimming calls for one breath every third arm recovery or every 1.5 cycles, alternating the sides for breathing. Some swimmers instead take a breath every cycle, i.e., every second arm recovery, breathing always to the same side. Most competition swimmers will breathe every other stroke, or once a cycle, to a preferred side. However some swimmers can breathe comfortably to both sides. Sprinters will often breathe a predetermined number of times in an entire race. Elite sprinters will breathe once or even no times during a fifty metre race. For a one hundred metre race sprinters will often breathe every four strokes, once every two cycles, or will start with every four strokes and finish with every two strokes. In water polo and water rescue, the head is often kept out of the water completely for better visibility and easier breathing, at the price of a much steeper body position and higher drag.
The body rotates about its long axis with every arm stroke so that the shoulder of the recovering arm is higher than the shoulder of the pushing/pulling arm. This makes the recovery much easier and reduces the need to turn the head to breathe. As one shoulder is out of the water, it reduces drag, and as it falls it aids the arm catching the water; as the other shoulder rises it aids the arm at end of the push to leave the water.
Side-to-side movement is kept to a minimum: one of the main functions of the leg kick is to maintain the line of the body.
The start is the regular start for swimming. After entering the water a brief underwater gliding phase follows, followed by an underwater flutter kick or butterfly kick. After a maximum of 15 metres underwater the swimmer has to surface and start swimming, in compliance with FINA regulations of competitive swimming events.
Racing: turn and finish
The front crawl swimmer uses a tumble turn (also known as a flip turn) to reverse directions in minimal time. The swimmer swims close to the wall as quickly as possible. In the swimming position with one arm forward and one arm to the back, the swimmer does not recover one arm, but rather uses the pull/push of the other arm to initialize a somersault with the knees straight to the body. At the end of the somersault the feet are at the wall, and the swimmer is on his or her back with the hands over the head. The swimmer then pushes off the wall while turning sideways to lie on the breast. After a brief gliding phase, the swimmer starts with either a flutter kick or a butterfly kick before surfacing no more than 15 m from the wall.
A variant of the tumble turn is to make a somersault earlier with straight legs, throwing the legs toward the wall and gliding to the wall. This has a small risk of injury because the legs could hit another swimmer or the wall.
For the finish the swimmer has to touch the wall with any body part, usually the hand. Most swimmers sprint the finish as quickly as possible, which usually includes reducing their breathing rate.
A variation of front crawl often used in training involves only one arm moving at any one time, while the other arm rests and is stretched out at the front. This style is called a "catch up" stroke because the moving hand touches, or "catches up" to the stationary one before the stationary hand begins its motion. Catch up requires more strength for swimming because the hand is beginning the pull from a stationary position rather than a dynamic one. This style is slower than the regular front crawl and is rarely used competitively; however, it is often used for training purposes by swimmers, as it increases the body's awareness of being streamlined in the water. Total Immersion is a similar technique.
The side swimming, or six kicks per stroke, variation is used in training to improve swimmers' balance and rotation and help them learn to breath on both sides. Swimmers stretch one arm out in front of their bodies, and one on their sides. They then kick for six counts and then take a stroke to switch sides and continue alternating with six kicks in between.
Another training variation involves swimming with clenched fists, which forces swimmers to use more forearm strength to propel them forward. 
- Maglischo, Ernest W. Swimming fastest p. 95 
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- Hines, Emmet. "How many strokes per length should I be taking?". Distance per Stroke. US Masters Swimming. Retrieved 10/31/2012.
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Media related to Front crawl at Wikimedia Commons
- Swim.ee: Detailed discussion of swimming techniques and speeds
- Crawl, Freestyle swimming: Front crawl technique page
- Additional information About Freestyle and Front Crawl