Backstroke, also known as back crawl, is one of the four primary competitive swimming strokes regulated by World Aquatics, performed while the swimmer lies supine on the water's surface. It combines alternating overhead arm pulls—typically with a bent-elbow recovery and straight or slightly bent underwater phase—with a continuous flutter kick from the hips, enabling efficient propulsion while keeping the face above water for unobstructed breathing.[1][2]Backstroke originated in the late 19th century as an adaptation of front crawl performed on the back and evolved into its modern form in the 1930s. It debuted as an Olympic event in the men's 200 m distance at the 1900 Paris Games, with the 100 m added for men in 1904; women's events began with the 100 m in 1924 and the 200 m in 1968.[3]In competition, backstroke is governed by World Aquatics rules requiring swimmers to start from the water gripping the pool edge, remain on their back throughout except during turns, and finish by touching the wall while supine. Submersion is restricted to 15 m after each start and turn (some part of the body must break the surface by 15 m), and throughout the race except during turns and after the head passes the 5 m mark before the finish (provided the surface was broken prior); body roll is limited to less than 90 degrees from horizontal. Key innovations include the allowance of dolphin kicks underwater after 1988 (limited to 10 m initially, extended to 15 m in 1991) and flip turns permitted since 1991, along with the 2023 update permitting full submersion in the final 5 m.[4][1][5]As the second-slowest stroke after breaststroke—with elite velocities ranging from 1.44–1.90 m/s for 50 m (men) to 1.20–1.68 m/s (women)—backstroke demands high anaerobic capacity, with post-race blood lactate levels of 9.1–14.0 mmol/L across distances. It is contested in individual 100 m and 200 m events, as well as relays and medley races at major competitions like the Olympics and World Championships, where flags 5 m from walls aid orientation since swimmers face the ceiling. The stroke's efficiency, second only to freestyle, makes it valuable for training endurance and recovery while building core stability and shoulder strength.[6][1]
History
Origins
The modern competitive backstroke emerged in the late 19th century as a supine adaptation of the front crawl, with swimmers applying an overarm arm motion and flutter kick while lying on their backs to improve efficiency over earlier back-floating styles. This evolution drew inspiration from the front crawl's mechanics, which incorporated Pacific Islander techniques observed by Australian swimmers around 1893, allowing for faster propulsion in a back-lying position.[3][7]By the late 19th century, backstroke saw its first competitive use in Europe and the United States, where British and American swimmers began formalizing it as a regulated style in national meets, distinguishing it from rudimentary back-floating methods through standardized rules on arm and leg actions.[8][9]Backstroke debuted as an Olympic event at the 1900 Paris Games with the men's 200-meter race, won by Ernst Hoppenberg of Germany in a time of 2:47.0. Women's backstroke was not introduced until the 1924 Paris Olympics, starting with the 100-meter event, reflecting the gradual inclusion of female competitors in the sport.[10][3]Early pioneers, such as American swimmer Harry Hebner, significantly advanced the stroke by popularizing the inverted arm crawl variant—mirroring the front crawl's alternating overhead recovery—during competitions from 1900 to 1912, including his gold medal win in the 100-meter backstroke at the 1912 Stockholm Olympics. This innovation shifted backstroke toward greater speed and became a foundational element of the style.[11][12]
Development in competitive swimming
The 100-meter backstroke event for men was introduced at the 1904 St. Louis Olympics, marking a shift from the longer 200-meter distance debuted in 1900, while the women's 100-meter event followed in 1924 at the Paris Games.[3] Early competitive backstroke drew from breaststroke influences, featuring a wide kick and straight-arm recovery, but by the 1920s, swimmers adopted a flutter kick derived from the front crawl for greater propulsion, enhancing overall speed. In the 1930s, Australian swimmers revolutionized the stroke by introducing a bent-arm pull, replacing the earlier straight-arm recovery to generate greater propulsion and speed.[13][3]Key innovations in starting techniques emerged to optimize launch efficiency, including the development of backstroke bars in the mid-20th century that provided better grip on starting ledges, and the introduction of Omega-style blocks with integrated ledges in the 2000s, which further improved grip and reduced slippage.[9] FINA rule changes in the late 2000s, including updates to block designs post-2008 Olympics, allowed for more versatile foot positioning—fully or partially immersed—contributing to faster entry velocities of up to 3.8 m/s in studies of elite swimmers.[14]Performance advanced significantly with the relaxation of underwater rules in the 1990s; after FINA extended the submersion limit from 10 meters in 1988 to 15 meters in 1991, swimmers incorporated extended dolphin kicks, enabling faster initial segments and overall time reductions, as seen in the widespread adoption of face-down dolphin techniques by the late 1990s.[13] In the 2000s, Aaron Peirsol exemplified this progress, breaking the men's 100-meter backstroke world record six times between 2002 and 2009, with his final mark of 51.94 seconds, alongside dominance in the 200-meter event.[15]Women's backstroke achieved greater parity with men's events by the 1970s, bolstered by expanded Olympic programming and the influence of Title IX in the United States, which increased female participation to nearly 46% of swimming athletes by 1972.[16]Kornelia Ender of East Germany set a world record in the women's 100-meter backstroke during this era, contributing to her tally of 23 individual records from 1973 to 1976 and highlighting rapid advancements in female performance.[17] In the 2000s, trends toward more streamlined body types—emphasizing reduced drag through training and physiology—combined with high-tech suits like the Speedo LZR Racer, yielded performance gains of 1-3.5% across strokes, including backstroke, before their ban in 2009.[18]
Technique
Body position
In backstroke swimming, the body position begins with the swimmer lying supine on the surface of the water, maintaining a flat alignment to minimize hydrodynamic drag. The head remains neutral, with ears submerged and eyes directed toward the ceiling, avoiding any tilting or lifting that could disrupt balance. The spine stays straight, forming a continuous line from the head through the hips to the feet, while core muscles—including the abdominals, obliques, and spinal erectors—are actively engaged to provide stability and prevent excessive undulation.[19][20]A key element of efficient body position is the continuous body roll, where the hips and shoulders alternate in rotation approximately 30-45 degrees from the horizontal plane on each side. This rotation, synchronized with the arm pulls and leg kicks, enhances reach during the stroke and generates additional propulsion by leveraging the body's longitudinal axis. Proper shoulder alignment during the roll ensures that the arms do not cross the body's midline, maintaining a streamlined path; for hand entry, the thumb points upward with the pinky finger leading to facilitate an effective catch without disrupting the roll.[21][22]Common errors in body position include arching the back, which increases drag by elevating the shoulders and chest, or sinking the hips, often resulting from lifting the head or insufficient core engagement. These issues can be corrected through targeted drills, such as single-arm backstroke swimming, which emphasizes maintaining the roll and neutral head position on one side while focusing on core stability. This integration of body roll with arm and leg actions establishes the rhythmic foundation for the overall stroke.[19][20]
Arm technique
In backstroke swimming, the arm technique involves an alternating overhead cycle that serves as the primary source of propulsion, contributing approximately 70-80% of the forward thrust through coordinated pulling actions.[23] The cycle consists of distinct entry, pull, and recovery phases, performed continuously with one arm while the other executes the opposite phase to maintain rhythm and balance.[24]During the entry phase, the arm extends straight overhead from the recovery position, entering the water pinky-first at approximately the 11 or 1 o'clock position relative to the swimmer's body, with the palm facing away from the body to establish an effective initial catch.[24][25] This positioning, slightly wider than shoulder-width, allows for maximal leverage during the subsequent pull, particularly benefiting shorter swimmers by accommodating a broader arc to compensate for reach limitations.[26][27]In the pull phase, the elbow bends to maintain a high-elbow position, directing the forearm and palm in a semi-circular underwater path toward the hip, where the hand pushes the water backward to generate forward thrust.[20][25] The palm rotates to face the feet midway through the motion, ensuring efficient pressure against the water, while the opposite arm simultaneously recovers above the surface to minimize drag.[24] This high-elbow bent-arm action reduces resistance and maximizes propulsion efficiency compared to a straight-arm pull.[28]The recovery phase begins as the pulling arm exits the water thumb-first near the hip, then swings in a relaxed, low "windmill" trajectory over the water surface—keeping the arm relatively straight and close to the body—to prepare for the next entry while minimizing air resistance.[20][29] Elite swimmers often emphasize a forceful drive into the entry to enhance momentum, with the recovery synchronized briefly with body roll for overall stroke efficiency.[29][25]While the traditional technique relies on single-arm alternation for endurance events, sprinters may incorporate brief double-arm pulls—where both arms enter and pull simultaneously—to accelerate power output and speed, though this is more common in training drills to refine mechanics.[30][31]
Leg technique
In backstroke, the leg technique primarily employs a flutter kick, characterized by alternating up-and-down movements initiated from the hips rather than the knees. The standard pattern is a six-beat flutter kick per arm cycle, where six kicks occur during the completion of one full armstroke on each side. This involves the up-kick, powered mainly by the hip flexors and quadriceps for propulsion, with the knee bending slightly before straightening to push against the water, followed by the down-kick, driven by the hamstrings and glutes to set up the next up-kick while keeping the leg relatively straight. Ankles remain relaxed and flexed to create a whip-like action, with toes pointed throughout to maximize efficiency and minimize drag.[32][33]The kick's amplitude is small and rapid, typically confined to the "shadow of the body" to avoid excessive drag and breaking the water's surface tension, with a maximum width of about 18 inches. Kicks should be quick and narrow, avoiding any snapping at the knee, to maintain a streamlined body line. This motion contrasts with broader or slower kicks, emphasizing hip-driven power over knee flexion for optimal hydrodynamic flow.[32][33]Additionally, a dolphin kick, involving undulating whole-body waves from the core, is permitted off the walls after starts and turns, up to a maximum of 15 meters underwater, to capitalize on initial velocity before transitioning to the flutter kick.[32][34]The flutter kick plays a crucial role in maintaining stability and overall stroke efficiency, preventing the hips from sinking by countering gravitational drag and facilitating subtle body rotation synchronized with the arms. It contributes secondary propulsion—primarily from the up-kick—while prioritizing drag reduction over primary power generation. Common errors include "bicycling" kicks, where legs move in a circular, knee-dominant pattern that breaks the surface and increases resistance, or overly wide and forceful kicks that amplify drag without proportional speed gains. To correct these, drills such as vertical kicking (treading water with a focused flutter from the hips) or single-leg kicking on the back emphasize proper initiation and amplitude, helping swimmers develop muscle memory for a tight, efficient motion.[32][35][36]
Breathing
In backstroke, the supine body position positions the face above the water surface at all times, enabling continuous and uninterrupted access to air without the need to turn the head or lift it as in other strokes. This natural visibility allows swimmers to breathe freely, reducing the risk of water inhalation and supporting a relaxed respiratory flow.[37]Breathing is coordinated with the arm action for optimal efficiency: inhalation occurs during the recovery phase when the arm is extended overhead and away from the face, while exhalation takes place during the underwater pull to maintain a steady rhythm. A consistent pattern, such as bilateral breathing every full stroke cycle or unilateral breathing every arm recovery on one side for beginners, helps synchronize respiration with propulsion and prevents irregular pacing. Holding the breath should be avoided, as it leads to muscle tension and reduced endurance.[20][37][38]Advanced swimmers refine this by timing deep inhales with the natural body roll to one side, which aligns the airway optimally and minimizes disruption to balance. Peripheral vision is employed during these moments to monitor lane lines and walls, ensuring straight-line swimming without pausing the breath cycle.[39][40]Beginners frequently face disorientation from the inverted supine view, which can cause anxiety and hesitation in maintaining the position. To overcome this, introductory drills like prolonged back floating or gentle bobbing on the back—alternating slight knee bends to propel while keeping the head neutral—build familiarity and confidence before progressing to full strokes.[37][41]
Starts
In the backstroke start, swimmers position themselves in the water facing away from the starting direction, with feet placed on the wall or backstroke ledge in a T-position approximately 6-8 inches apart to provide stability and maximize push-off force.[42] The hands grip the starting bar or block behind the head, shoulder-width apart, while the body assumes an arched posture with the head tucked forward toward the block, knees bent at about 90 degrees, and the hips elevated to distribute weight evenly across the body for an explosive launch.[42] Recent World Aquatics (formerly FINA) rules permit a track-start variant on the backstroke ledge, where one foot is positioned slightly forward of the other, provided at least one toe of each foot remains in contact with the end wall or touchpad face to prevent slipping.[43][44]Upon the starting signal, the launch begins with an explosive push-off from the legs, driving the body backward while the arms swing overhead into a streamlined position, propelling the swimmer into the water at an optimal angle of 30-45 degrees to minimize drag and maximize forward momentum.[42] The hands enter the water first, followed by the head and then the body, with the swimmer remaining on their back throughout.[42] Submersion is allowed up to 15 meters from the start, during which the swimmer performs undulating dolphin kicks to maintain speed.[43]The streamline phase immediately follows the entry, with hands stacked one over the other, fingers pointed, and pressed tightly against the sides of the head to reduce resistance; the head remains neutral and aligned between the biceps, while the core is engaged to keep the body straight and elongated.[42] This position, maintained at least one foot below the surface, incorporates powerful dolphin kicks for propulsion before the swimmer breaks out into the full backstroke after the undulation phase.[42] Elite swimmers typically achieve reaction times under 0.7 seconds from the signal to push-off, emphasizing the need for precise timing and minimal delay.[45]The backstroke start has evolved from the traditional grab start used before the 2020s, where swimmers simply gripped the pool edge or gutter with toes curled over for traction, to modern wedge blocks approved by FINA in 2013 and implemented widely by the 2016 Olympics to enhance stability and prevent slips.[9] These wedge systems, adjustable and FINA-compliant, provide a sloped surface extending from the starting block into the water, allowing for more consistent foot placement and greater explosive power compared to earlier flat-wall or basic grip setups.[9]
Turns and finishes
In backstroke, turns are executed using an open flip turn, where the swimmer approaches the wall on their back with alternating arm strokes and a flutter kick, maintaining the body position on the back until the final arm pull.[46] As the head nears the wall, the swimmer executes the last arm stroke, touches the wall with one or both hands simultaneously (or another body part), tucks the chin to initiate rotation toward the vertical position, and performs a somersault while avoiding contact with the wall during the flip.[2] Upon completing the rotation, the feet plant against the wall for a strong push-off into a streamlined position on the back, often incorporating one or more dolphin kicks to maximize underwater speed up to the 15-meter mark.[2]World Aquatics rules (formerly FINA) require swimmers to remain entirely on their back throughout the race until the initiation of the turn, with the body rotating past vertical to the breast only after the wall touch via a continuous single or double arm pull.[2] The turn must include a clear touch of the wall with some body part, and upon leaving the wall, the swimmer must immediately return to the back position without additional pulls or kicks beyond those initiating the turn; dolphin kicks are prohibited during the approach or rotation but permitted post-push-off.[2] Violations, such as rotating to the front before touching or using improper leg actions like alternating non-horizontal kicks, result in disqualification.[2]The finish requires a direct touch of the wall while on the back, typically with both hands simultaneously at, above, or below the water surface, without a prolonged glide.[2] Under the 2023 rule update, swimmers may fully submerge after the head passes the 5-meter mark before the wall, allowing a streamlined dolphin kick approach to the touch, provided the body remains oriented on the back at contact; this change reduces disqualifications from partial submersion errors.[5] A common error is initiating a premature flip without a legal touch, leading to disqualification for failing to maintain the back position.[2]Drills such as one-arm backstroke approaches to the wall help refine timing for the final stroke and touch, emphasizing controlled rotation and hand placement to prevent early flips.[47] In race strategy, particularly for the 200-meter event, efficient turns contribute significantly to overall time savings, as each flip turn can shave up to 0.5 seconds compared to less optimized executions, influencing pacing decisions to build speed on the back half while preserving energy for multiple wall interactions.[48]
Competitive backstroke
Events and distances
In competitive swimming, backstroke events are contested over standard distances of 50 m, 100 m, and 200 m in both long-course (50 m pools) and short-course (25 m pools) formats. These distances emphasize varying aspects of the stroke, with the 50 m sprint focusing on explosive speed and starts, while the 100 m and 200 m incorporate endurance and pacing strategies.[49] In long-course meters, the 50 m event highlights raw power, particularly in turns and underwater phases, whereas short-course races allow more frequent wall contacts, influencing overall race dynamics.[50]Backstroke integrates into relay events primarily as the opening leg of the 4 × 100 m medley relay, where the backstroker starts from the water and covers 100 m before tagging the breaststroker.[51] There are no dedicated all-backstroke relays in major competitions, as medley formats promote stroke diversity across team members.[52]At the Olympic Games, backstroke is limited to 100 m and 200 m individual events for both men and women, as seen in the 2024 Paris program, with the 50 m distance approved for addition starting in 2028. World Aquatics Championships feature the full suite of 50 m, 100 m, and 200 m events in long course, alongside equivalent short-course distances at their dedicated 25 m meets.[53] In collegiate competition, the NCAA Division I Championships use short-course yards (25 yards per length), offering 100 yard and 200 yard backstroke events as direct equivalents to metric distances.[54]At the age-group level, competitions prioritize 50 m and 100 m backstroke to build foundational technique and speed, with 200 m introduced later for developing endurance.[55] Open-water variants of backstroke are rare in formal events, though the stroke is permitted in triathlons for recovery or as an alternative to freestyle during the swim leg.[56]
World records
World records in backstroke swimming are maintained separately for long course (50-meter pools) and short course (25-meter pools) by World Aquatics, the sport's governing body, which verifies all submissions through a rigorous process involving video review, timing systems, and technical standards to ensure fairness and accuracy.[57] Since the early 2000s, particularly during the 2008-2009 era, backstroke records have been broken frequently due to advancements in polyurethane "tech suits" that reduced drag and enhanced buoyancy, leading to over 140 world records across all events before World Aquatics (then FINA) restricted full-body suits in 2010 to preserve competitive integrity.[58][59]
Long Course World Records
The following table summarizes the current long course world records for the primary backstroke events as of November 2025:
These records highlight the evolution of backstroke technique and equipment, with the men's 200 m mark standing as one of the few "super-suited" times from the pre-2010 era that remains unbroken, underscoring its historical significance.[58]
Short Course World Records
Short course records, swum in 25-meter pools, often yield faster times due to fewer turns and increased wall propulsion opportunities. Recent updates from the 2025 World Aquatics Swimming World Cup series reflect ongoing progress in the discipline. The table below lists the current short course world records for the 100 m events as of November 2025:
These short course benchmarks contribute to relay strategies in mixed events, where backstroke legs can provide critical speed advantages.[60]
Olympic champions
The men's 100 m backstroke has seen strong American dominance historically, with swimmers like Aaron Peirsol securing gold medals at both the 2004 Athens and 2008 Beijing Olympics, contributing to the United States' 15 total golds in the event since its inception in 1908.[15] In recent editions, Ryan Murphy of the United States won gold at the 2020 Tokyo Olympics with an Olympic record time of 51.85 seconds, marking the first Olympic record in the event since 2008.[63] At the 2024 Paris Olympics, Italy's Thomas Ceccon claimed the gold in 52.00 seconds, becoming the first Italian man to win the event and breaking the American streak.[64]In the men's 200 m backstroke, introduced to the Olympics in 1900 but standardized in its modern form later, the United States also held sway for decades, exemplified by Peirsol's victories in 2004 (1:54.74) and 2008 (1:53.94).[15]Evgeny Rylov of the Russian Olympic Committee set an Olympic record of 1:53.27 to win gold at the 2020 Tokyo Games.[63] Hungary's Hubert Kós captured the 2024 Paris title in 1:54.26 seconds, showcasing a strong finishing kick to edge out the field.[65]The women's 100 m backstroke, debuting in 1924, has featured rising Australian prowess in recent years, with Kaylee McKeown defending her title from the 2020 Tokyo Olympics (57.47 seconds) by winning gold at the 2024 Paris Games in an Olympic record 57.33 seconds.[66] Earlier standouts include the United States' Missy Franklin, who took gold in 2012 London (58.33 seconds), and Natalie Coughlin's back-to-back wins in 2004 and 2008.For the women's 200 m backstroke, added in 1968, McKeown continued her dominance at the 2024 Paris Olympics, winning gold in an Olympic record 2:03.73 seconds after her 2020 Tokyo victory (2:04.68).[66]Franklin also excelled here, securing gold in 2012 with 2:04.06 seconds, while earlier icons like East Germany's Kornelia Ender won in 1976 (2:05.06).Overall, the United States maintained dominance in men's backstroke events through 2016, amassing over 20 golds across the 100 m and 200 m distances, though international breakthroughs like those in 2024 signal shifting dynamics. In women's events, Australia's ascent is evident with McKeown's four individual golds since 2020, contrasting earlier U.S. and East German leads.[67] Notably, no 50 m backstroke event has been contested at the Olympics.[63]
Notable swimmers
Sybil Bauer was a pioneering American swimmer in the 1920s who became the first woman to hold the world record in the 100-meter backstroke, setting it multiple times and breaking an existing men's record in the process. Competing at the 1924 Paris Olympics, she won gold in the 100-meter backstroke, establishing her as a dominant force in the event during the early era of women's competitive swimming.[68] Bauer's achievements, including 23 world records in backstroke, laid foundational benchmarks for the stroke's technique and performance standards before her career was tragically cut short by illness at age 23.[69]Kornelia Ender, representing East Germany in the 1970s, secured four Olympic gold medals in swimming, with notable successes in backstroke events that highlighted the era's emphasis on specialized training. At the 1972 Munich Olympics, she claimed gold in the 100-meter backstroke, contributing to her legacy as one of the most decorated female swimmers of the decade.[70] Ender's backstroke prowess, combined with her versatility across strokes, influenced training methodologies in competitive swimming during the Cold War period.Aaron Peirsol of the United States dominated men's backstroke in the 2000s, earning five Olympic gold medals, including individual titles in the 100-meter and 200-meter events at the 2008 Beijing Games and the 200-meter in 2004 Athens.[15] He also captured seven world championship titles in backstroke disciplines, underscoring his consistency across major international competitions. Peirsol held the long-course world records in both the 100-meter (from 2005 to 2009) and 200-meter backstroke (2005-2009), breaking the 100-meter mark six times, with his final record of 51.94 set in 2008.[15] Known for pioneering aggressive underwater dolphin kicking techniques off the walls, he revolutionized race strategies by maximizing speed in the initial phases of each lap.[71]Natalie Coughlin, another American standout, won three Olympic gold medals in backstroke-related events, including the 100-meter backstroke at the 2004 Athens and 2008 Beijing Olympics.[72] She specialized in the 200-meter backstroke as well, earning multiple medals and contributing to U.S. relay successes. In 2002, Coughlin became the first woman to swim the 100-meter backstroke under one minute in short course, clocking 59.44 seconds.[73]Ryan Murphy has amassed six Olympic medals in backstroke, with four golds from the 2016 Rio and 2020 Tokyo Games, including the 100-meter and 200-meter individual events in Rio.[74] He set the Olympic record of 51.85 seconds in the 100-meter backstroke during the 2016 Olympic 4x100m medley relay lead-off.[63] Murphy's endurance in the 200-meter backstroke has been a hallmark of his career, enabling him to maintain competitive pacing over longer distances.[75]Kaylee McKeown of Australia emerged as a backstroke powerhouse in the 2020s, securing four Olympic gold medals by the 2024 Paris Games, including both the 100-meter and 200-meter backstroke titles in Tokyo and Paris.[76] She has set multiple world records in the discipline, such as the short-course world records in the 200-meter backstroke, which she has broken multiple times in 2025.[77] McKeown's technical precision and speed have redefined women's backstroke standards in recent Olympic cycles.[78]