Sprint triathlon: distances, rules and what to expect

A sprint triathlon is a common first race. Under British Triathlon rules it is a 750 m open-water swim, a 20 km bike and a 5 km run, or a 400 m swim when the race is held in a pool. The super sprint is shorter: 250 m, 10 km and 2.5 km.

This guide covers the official sprint triathlon distances, the difference between pool and open-water sprints, what happens on the day of your first race, and a short list of UK sprint races whose details we checked on the organisers' own pages.

Sprint triathlon distances

These are the distances in Appendix A of the British Triathlon Competition Rules 2026 (April 2026 version), with rounded miles. The minimum age is your age on 31 December of the race year.

Organisers fit courses to their venue, so real races vary. Supertri Blenheim Palace runs its sprint over 750 m, 19.8 km and 5.4 km. The Thames Turbo Sprint Triathlon in Hampton uses a 432 m pool swim, a 21 km bike and a 5 km run. Royal Windsor Triathlon gives its sprint bike as 20 km in one place on its site and 22 km in the course description. Check the course page for the race you enter. For how sprint compares with the longer formats, see our guide to all triathlon distances.

What is a super sprint triathlon?

The super sprint is the shortest individual format in the British Triathlon rules: a 250 m swim, 10 km bike and 2.5 km run. It is a good taster if you are unsure about the full sprint, or if you want a first race that needs less training time.

As with the sprint, many organisers set their own swim length. The London T100 super sprint uses a 400 m swim with a 10 km bike and 2.5 km run. Supertri's SuperSprint at Blenheim Palace is 400 m, 13.3 km and 2.9 km, and its page mentions a youth category in the Sunday SuperSprint (the age is not stated there, so ask the organiser).

Pool sprint or open-water sprint?

The two versions share the same bike and run. The difference is the swim, and for many first-timers the swim decides which race they enter.

Pool sprint

In a pool sprint you swim 400 m (or the organiser's set distance) in a lane, with walls and lane ropes around you. The water is clear and calm and you can see the bottom. If you are not yet confident swimming without a wall nearby, this is the gentler first step. The Thames Turbo Sprint Triathlon is one example in the London area: the swim is in Hampton Open Air Pool and the run is in Bushy Park.

Open-water sprint

An open-water sprint usually means a 750 m swim in a lake, river or dock. You swim among other people, you cannot see far underwater, and you have to look up now and then to check your line to the next buoy (called sighting). Practise this before race day at a supervised open-water venue. Our guide to open-water swimming in London lists supervised venues and how their sessions work. Never practise in the Thames, canals or docks outside an organised session.

Wetsuit rules apply in open water. For swims up to 1500 m, which covers every sprint, British Triathlon makes a wetsuit mandatory below 15.9 °C. It is forbidden above 22 °C if you are 59 or younger, or above 24.6 °C if you are 60 or older. In between, it is your choice. Below 11 °C there is no open-water swim in competition, and at 11 °C the swim is limited to 300 m. The organiser takes the temperature one hour before the start and tells you the decision.

What a first sprint triathlon involves

A sprint triathlon is three sports in a row with two changeovers. The changeovers are called transitions: T1 is swim to bike and T2 is bike to run. The clock runs through both, so the time you spend changing counts towards your finish time.

Before the race

• Entry and Race Pass. Races permitted by British Triathlon require public liability cover. If you live in the UK and do not hold Core or higher annual membership, you need a Race Pass, which covers that one race. It costs £2 up to age 24 and £8 from age 25, age counted at 31 December (checked 6 October 2026; prices change). Some race entries include it. If not, you buy it through the British Triathlon event search.
• Read the race information. Check the course, start times, whether the roads are closed or open, and whether the race is draft-legal or non-drafting.
• Kit. You need a bike that works, a cycling helmet, running shoes, goggles and something to race in. A tri suit is convenient but not required. Our guide to what to wear for a triathlon has a full kit list.

On the day

You register, collect your race number and set up your place in transition: the area where every athlete's bike is racked, with shoes, helmet and kit beside it. Then you go to the swim start. After the swim you run to your bike, put on your helmet and follow the marshals' directions out of transition onto the bike course. After the bike you rack it, take off your helmet, change shoes and run.

On the bike

The race information tells you whether the bike leg is draft-legal or non-drafting. Drafting means riding in the slipstream of another rider. In a non-drafting race, under British Triathlon rules the draft zone is 12 m long, measured from the leading edge of the front wheel of the rider ahead. You may enter it, but you must be seen to be moving through, and you have a maximum of 25 seconds to pass. On open roads the Highway Code applies as well. Our guide to triathlon rules in the UK explains drafting, wetsuits and transition rules in more detail.

UK sprint triathlon examples

These races publish sprint or super sprint distances on their own websites. Dates in 2026 have passed; we list a 2027 date only where the organiser has published one. All details checked on 6 October 2026.

London T100 Triathlon

The age-group races of the London T100 are held at ExCeL London with a freshwater swim in Royal Victoria Dock. Alongside the sprint and super sprint there are Olympic and T100-distance races. The participate page lists the swim as 18 to 24 °C, wetsuit. Our London triathlon guide has the full details.

Royal Windsor Triathlon

Organised by RunThrough from Alexandra Gardens in Windsor, with a river swim downstream then upstream. The sprint minimum age is 15. The bike is on open roads, where the Highway Code applies, and the run goes into Windsor Great Park and along the Long Walk. The race was first held in 1991.

Supertri Blenheim Palace

Formerly the Blenheim Palace Triathlon, now run by Supertri. The swim is in the Great Lake and the bike has closed-road sections through the palace grounds. Check the official page for the full list of race options on each day.

Thames Turbo Sprint Triathlon

A club-run pool race from Hampton Open Air Pool, with the run in Bushy Park. The organising club describes it as ideal for a first triathlon. The 2027 date had not been published when we checked, so watch the club's races page.

How to prepare for a sprint triathlon

A sprint is a realistic target for many healthy adults who can already swim continuously and ride a bike. A common structure is two sessions of each sport a week, plus one brick session, which is a bike ride followed straight away by a short run so your legs learn the change. Build up gradually and keep most sessions easy. Our sprint triathlon training plan sets out sample weeks.

If you have a medical condition, or you have been inactive for a while, see your GP before you start hard training. Training plans are general guidance and do not promise any particular result.

Frequently asked questions