Gemopedia
Aquatic Sports🇬🇧United Kingdom Olympic19th century

Swimming

Officially Competitive Swimming

Aquatic racing sport contested in a pool over set distances in four legal strokes — freestyle, backstroke, breaststroke and butterfly — plus medley events.

📐swimming pool⏱~30 min🌤both
Photo · Wikipedia

What is Swimming?

Competitive swimming is an individual and team aquatic sport in which racers cover set distances in specified strokes for the fastest recorded time. World Aquatics (formerly FINA) recognises four strokes — freestyle (typically front crawl), backstroke, breaststroke and butterfly — plus individual medley (IM) events that use all four strokes, and freestyle and medley relays. Races are held in a 50-metre long-course pool (Olympic) or a 25-metre short-course pool. Swimming has been in the modern Olympic programme since 1896 for men and 1912 for women, and is the marquee sport of every Summer Games.

Quick facts

Category

Aquatic Sports

Type

Individual

Players

1–10

Duration

~30 min

Where played

both

Field / court

swimming pool

Country of origin

🇬🇧 United Kingdom

Estimated origin

First national swimming championships 1837 (National Swimming Society, London)

Olympic

Yes

Popularity

global

How it works

Objective

Complete the specified distance in the specified stroke faster than every other swimmer in the race.

Match structure

Heats seed swimmers into semifinals or finals based on entry times. Swimmers race in eight-lane finals; the finish is recorded to the hundredth of a second by touch pads. Relays involve four swimmers each covering an equal leg — freestyle relays (all crawl) or medley relays (back, breast, fly, free in order).

Rules

Basic rules

  • Legal strokes

    Freestyle (any stroke; universally front crawl for speed), backstroke (on the back throughout), breaststroke (simultaneous symmetric limb motion, head breaks the surface each cycle), butterfly (simultaneous arm recovery over the water, dolphin kick).

  • Starting and finishing

    Freestyle, breast, fly and IM start from the block; backstroke starts in the water. Each race requires a legal touch at each wall — two-handed for breast and fly, single-hand or foot for free and back.

  • Turns

    Freestyle allows a tumble (flip) turn; backstroke uses a back-to-front rollover into a flip; breast and fly require simultaneous two-hand touches on turns.

  • Underwater phases

    Maximum 15 m underwater off starts and turns in freestyle, backstroke and butterfly.

  • False starts

    Any movement before the starting signal is a disqualification (single-start rule since 2001).

  • Lane discipline

    Swimmers must remain in their lane; interfering with another swimmer's water is a DQ.

  • Relay changeovers

    The outgoing swimmer's feet must be on the block until the incoming swimmer touches — 0.03 s early = DQ.

Advanced rules

  • Breaststroke pull-out

    One arm pull to the thighs, one dolphin kick before the first breaststroke kick is allowed off the start and each turn.

  • Butterfly kick on breaststroke start

    Since 2005, breaststrokers may take one dolphin kick during the underwater pull-out.

  • Medley order

    Individual medley: butterfly → backstroke → breaststroke → freestyle. Medley relay: back → breast → fly → free.

  • Suit rules

    Since 2010 (post 'super-suit' era), men's suits from waist to knee, women's from shoulder to knee; non-textile suits banned.

  • Backstroke flip turn

    Swimmer may rotate onto the front, take one continuous arm pull into the wall, then flip — must remain on the back on push-off.

Scoring

Ranked by finishing time; first to touch the wall wins.

ActionPoints
First to touch wall (final)1st place / medal
Team relay finish1st place team
Point system (dual meet)9-7-6-5-4-3-2-1

Win condition · Fastest recorded time wins; in championships, top 8 heat times advance to finals.

Playing area

Called

swimming pool

Dimensions

Long-course: 50 m × 25 m, 2 m deep, 8-10 lanes each 2.5 m wide. Short-course: 25 m × 21 m.

Rectangular pool with lane ropes, starting blocks, backstroke flags 5 m from each wall and touch pads at both ends for automatic timing.

Equipment

  • Swimsuit (technical suit)

    Fabric-only jammer for men / knee-length suit for women; suits are FINA-approved for competition.

  • Cap

    Silicone or latex cap to reduce drag and keep hair from goggles.

  • Goggles

    Low-profile racing goggles for pool clarity and lens tint.

  • Starting blocks

    Angled platforms with rear kick-back plate for a powerful racing start.

  • Backstroke ledge

    Adjustable platform attached to the wall for backstroke starts.

  • Timing pads

    Electronic touch pads at each end of the pool for automatic timing to 0.01 s.

Officiating

The starter releases the field; stroke/turn judges monitor legality at each end; the meet referee has final authority.

  • Meet Referee
  • Starter
  • Stroke and turn judges (per lane)
  • Chief timekeeper
  • Marshals
  • Recorders

Penalties & fouls

Penalties

  • Disqualification (DQ)

    Illegal stroke, missed touch, false start, or interference.

  • Warning

    Verbal or gestural warning by the head referee before a DQ where appropriate.

  • Reprimand / bans

    Long-term bans for doping violations — WADA-controlled, with independent testing.

Strategies

  • Front-half vs back-half racing

    Sprinters attack the first 50; distance swimmers reserve energy for a strong finishing kick.

  • Negative split

    Second half faster than the first — the physiologically optimal 400 m+ pattern.

  • Underwater dominance

    Elite swimmers exploit the 15 m underwater limit with high-frequency dolphin kicks (Phelps, Marchand).

  • Draft in relays

    Take advantage of a wide relay flip to enter smoothly and time the leg to peak arrival.

Terminology

IM
Individual medley — one swimmer, all four strokes in order fly/back/breast/free.
DQ
Disqualification for a stroke, turn, start or finish infraction.
PB
Personal best — a swimmer's fastest recorded time.
Split
Time recorded for a section of the race (e.g., 50-m splits in a 200 m).
Sculling
Small figure-8 hand motions for propulsion and feel of the water.
Catch
The initial hand entry and grip on the water at the start of the stroke.
Streamline
Hands stacked above the head, head between arms — the minimum-drag posture off starts and turns.
Taper
Pre-race reduction in training load to sharpen performance.
Broken swim
Repeat set at target race pace with short rests to build speed endurance.
Suit-up
Wearing the technical suit for a major race to maximise compression and buoyancy.

Major competitions

  • Summer Olympic Games

    quadrennial · worldwide · since 1896

  • World Aquatics Championships

    biennial · worldwide · since 1973

  • Pan Pacific Swimming Championships

    biennial · Pacific Rim · since 1985

  • European Aquatics Championships

    biennial · Europe · since 1926

  • FINA/ISL World Cup

    annual · worldwide (short-course) · since 1988

Where it is played

Governing bodies

Famous names & records

Famous athletes

  • Michael Phelps
  • Katie Ledecky
  • Ian Thorpe
  • Mark Spitz
  • Ariarne Titmus
  • Adam Peaty
  • Caeleb Dressel
  • Sarah Sjöström
  • Katinka Hosszú
  • Léon Marchand
  • Summer McIntosh
  • Aleksandr Popov

Records

  • Most Olympic gold medals (any sport)

    Michael Phelps — 23 (2016)

  • Most Olympic medals (any sport)

    Michael Phelps — 28 (2016)

  • Women's 400 m/800 m/1500 m freestyle WR

    Katie Ledecky — Multiple long-course WRs held simultaneously (2023)

  • Men's 100 m breaststroke WR

    Adam Peaty — 56.88 s (2019)

  • Men's 200 m IM WR

    Léon Marchand — 1:54.06 (2024)

Learn this sport

beginner

  1. 1

    Water comfort

    Breath control, floating, gliding — before any stroke work.

  2. 2
    Freestyle basics

    Body position, bilateral breathing, straight-arm recovery.

  3. 3

    Backstroke basics

    Balanced supine position, alternating arm recovery, high-elbow catch.

  4. 4

    Push-and-glide starts

    Off the wall streamline into 4-6 kicks before stroking.

intermediate

  1. 1

    Breaststroke and butterfly

    Two-hand touches, symmetric kick, timing of pull to breath.

  2. 2

    Flip turns

    Freestyle tumble turn — head down, tuck, plant feet, push into streamline.

  3. 3

    Race dive

    Track start on the block; press the wedge, explode into a shallow entry.

  4. 4

    Pacing drills

    Descending sets — hold split under increasing effort.

advanced

  1. 1

    Underwater work

    High-speed dolphin kick, streamline through the 15-m limit.

  2. 2

    Taper and race prep

    3-week taper, race warm-up sequence, mental race rehearsal.

  3. 3

    Long-course strategy

    Optimise stroke count and turn quality over 50-m laps at high fatigue.

Frequently asked

What are the four legal strokes?+

Freestyle (any stroke, universally front crawl), backstroke, breaststroke and butterfly.

Why is a 50 m pool called 'long course'?+

It's the standard Olympic pool length. A 25 m 'short course' pool has more turns per race, so short-course times are faster.

How is timing so precise?+

Electronic touch pads at each end record to the hundredth of a second and trigger the display.

Why does everyone wear a cap?+

It reduces drag and keeps hair out of goggles; caps also help team identification in relays.

How long is the longest Olympic swim event?+

1500 m freestyle (men) — often called the 'metric mile'; women contested 1500 m for the first time at Tokyo 2020.

Sources & provenance

Last verified 2026-08-24.community