Swimming

Swimming is the most instrumented sport here and the least dependent on officials for its result. Touchpads are triggered by the swimmer's own hand, so the finish is recorded without a human in the loop at all, to one hundredth of a second.

Where the sport stops trusting its instruments is instructive. Two swimmers on the same hundredth are declared a dead heat and both awarded the place. Swimming could resolve them by going to a thousandth, and it declines to — on the stated grounds that a lane cannot be built accurately enough for a thousandth of a second to mean anything. That is a governing body publicly setting the limit of its own precision, which is rare enough to be worth recording.

Officials still decide everything the touchpad cannot. Stroke judges walk the deck watching for illegal technique, turn judges stand at each end, and the starter controls the start. Their subject is the stroke definitions, which are rules rather than facts, so this is the one part of swimming that is judged rather than measured.

Underwater cameras changed that part of the sport, and in one case changed the rule instead of the enforcement. Breaststroke swimmers were adding a downward dolphin kick off the walls; the cameras showed it was near universal; surface officials could not see it. In 2015 the federation legalised a single kick rather than continue disqualifying the swimmers it happened to catch.

That is the honest response to a rule that technology reveals to be unenforceable — and it is the opposite of what most federations do, which is to add more surveillance and keep the rule.

Swimming's map is a map of pools, and pools are a map of money and climate. This is the most infrastructure-determined sport on the site after gymnastics, and unlike gymnastics the barrier applies at the very first step: a person cannot learn the sport at all without access to water and instruction.

Elite competition is concentrated in the United States, Australia, western Europe, Japan and China. What those have in common is not a swimming culture in any romantic sense; it is a density of 50-metre pools, a school or club system that teaches children to swim as a matter of course, and enough coaching to convert that into competition.

The consequence is a participation funnel unlike any other sport here. In football the barrier is that everyone plays. In swimming the barrier is that most of the world's population never gets the chance to, so the competitive pool — the phrase is unavoidable — is small, well resourced and stable.

This intersects with the rules in one direct way. When polyurethane suits were permitted between 2000 and 2009, a swimmer's equipment depended on their national federation's supplier contract, and swimmers tied to a slower manufacturer were competing on unequal terms through no choice of their own. That was part of the federation's stated case for the 2010 ban: an equipment arms race in a sport whose access is already unequal made the inequality visible at the elite level, where it had previously only operated at the entry level.

Competitive swimming as a governed sport dates from the National Swimming Society in London in the 1830s and the Amateur Swimming Association in 1869; FINA was founded in 1908 to run it internationally. Almost everything interesting about its rules comes from one structural fact: the strokes are themselves rules.

Freestyle is a category, not a technique — it means any style, and the crawl won because it is fastest. But breaststroke, backstroke and butterfly are defined by regulation. A breaststroke swimmer is doing breaststroke because the rulebook says what breaststroke is, and the entire history of those events is a history of swimmers finding faster motions that the definition did not quite exclude, and the federation deciding whether to exclude them.

Butterfly exists because of exactly this. It began in the 1930s as breaststroke swum with an over-water recovery, which the breaststroke rules did not forbid. Rather than ban it, FINA split it off into its own event in 1952. That is the generous version of the move; the underwater breaststroke ban of 1957 and the backstroke fifteen-metre limit are the restrictive version. Same mechanism, different answer.

For most of the twentieth century swimming had no equipment worth regulating. Goggles arrived in the 1970s, caps were a convenience, and the suit covered the trunk because the rules said so and nobody had a reason to want otherwise.

Then in 2000 FINA permitted full-body swimwear, and did it by removing a restriction rather than by writing a specification. That distinction is the whole story. Athletics, when it faced the javelin, wrote a tight construction specification and then had to keep amending it. Swimming wrote nothing, and for a decade the suit was the fastest-moving variable in the sport.

The end state was polyurethane: panels that compressed the body, trapped air, and raised the swimmer in the water so that less of them was in it. At the 2009 World Championships in Rome, forty-three world records fell in eight days. Paul Biedermann beat Michael Phelps over 200 m freestyle by nearly a second and said afterwards that the suit was worth about two seconds. Nobody in the sport seriously argued that the swimming had improved.

The 2010 rule is a construction specification arriving nine years late: textile only, no coverage of the neck, nothing past the shoulders or ankles, men's suits below the waist. It has held. What it did not do was touch the record book, and the charts on this page are what that decision looks like fifteen years on.

FINA — World Aquatics since 2023 — governs six aquatic disciplines through one body, which gives it an unusual internal politics: swimming's commercial weight subsidises the rest, and swimming's rule decisions are taken by a congress in which the other disciplines vote.

The suit episode is the federation's largest modern governance failure and its largest modern correction, and it is worth separating the two decisions taken in Rome in July 2009. The first — ban the suits — was close to unanimous and is not controversial. The second — let the records stand — was a separate judgement, and it is the one this site exists to record.

The reasoning given was that the marks were set legally under the rules then in force, and that retroactively annulling legal performances would punish athletes for a failure of governance. It is a defensible position and it is the opposite of the one World Athletics took over the javelin in 1986, where marks set legally under the rules then in force were annulled precisely because the governance had failed.

Both federations were right by their own lights. The difference is what each thought a record was for: a ranking of legal performances, or a comparable series. Swimming chose the first. Athletics chose the second.

Rome, July 2009. Forty-three world records in eight days, in an event that normally produces a handful a year. The suits were banned within days by a congress sitting at the same championships. The records stayed.

Fifteen years later the consequence is still on the page. The men's 200 m freestyle record set by Paul Biedermann in Rome has not been beaten. The post-2010 half of that chart is empty, and this site draws it empty rather than extending the axis or joining the segments, because an empty panel is what actually happened.

The 100 m freestyle is the more hopeful version of the same story: César Cielo's 46.91 from Rome stood until Pan Zhanle finally went under it in 2024. It took fifteen years for swimming to get back to where its equipment had briefly taken it.

Seoul, 1988. David Berkoff swam roughly the first third of the 100 m backstroke underwater, because underwater dolphin kick is faster than backstroke and the rules did not say how far you could go. FINA imposed a limit — ten metres, later fifteen — citing the hypoxia risk that had ended underwater breaststroke in 1957. It is also true that a backstroke race with no visible swimmers is unusable on television. The sources do not separate the two motives, so this site records the cause as disputed rather than choosing the flattering one.

The dolphin kick nobody could see. Breaststroke swimmers were performing an extra downward kick off the walls, underwater cameras showed it was near universal, and surface officials could not detect it. In 2015 FINA legalised it. A rule that cannot be enforced is enforced arbitrarily, and this is one of the few cases where a federation said so by acting.

Recorded as unsettled.

The 2009 records. The single largest open question in the sport, and it has been open for over fifteen years. Several world records were set in polyurethane suits that have been illegal since 2010, and the federation chose to let them stand. Periodic proposals to annul them, or to keep two lists, have gone nowhere. The argument for annulment is that a record nobody can reach under current rules is not a target but a wall; the argument against is that the marks were legal when set, and that punishing athletes for a governance failure is worse than living with the anomaly.

This site takes no position and notes only that World Athletics faced the same choice with the javelin in 1986 and decided the other way. Both federations are still living with their decision.

Underwater distance. Fifteen metres is an arbitrary number that caps the fastest part of a race. Swimmers who are exceptional underwater are limited by rule rather than by physiology, and proposals to extend, shorten or remove the limit recur. Extending it would advantage a different body type; removing it would return the sport to something closer to what the 1988 backstroke rule was written to prevent.

Short course and long course. The sport maintains two record lists for the same events because a 25-metre pool gives twice as many turns. It is a comparability break that the sport handled correctly and in advance, by never merging the series — which makes it the counter-example to almost everything else on this site.