Beginner triathlon guide: 3 workouts a week to get started

Swimming, cycling, and running back to back looks huge from a distance. Up close, it's a simple project: a short distance, three workouts a week, and a little gear.

This guide follows the rules and advice of the French Triathlon Federation (FFTRI), Swiss Triathlon, and a U.S. safety study. It leaves out "12-week" plans that aren't based on any source.

Choosing your first format: XS or S

The FFTRI classifies races into six formats, from XS to XXL. For a first try, the two shortest are more than enough. The M is there to show what comes next.

On its beginner advice page, the FFTRI also describes the XS differently: 500 m (0.31 mi), 20 km (12.4 mi), and 5 km (3.1 mi). So go by the distances listed on your race page.

The FFTRI's L format (3 km / 1.9 mi, 80 km / 49.7 mi, 20 km / 12.4 mi) is not a half Ironman. U.S. races use other names (sprint, Olympic), so don't mix up the naming systems.

Three workouts a week, at a moderate intensity

The FFTRI gives beginners a simple base: three workouts a week, one swim, one bike ride, and one run. With only one workout a week, it says, you lose most of the benefit of the previous one.

It's a federation baseline that is easy to stick to, and a good starting point. The federation refers to "scientific literature" without citing specific sources.

On intensity, the FFTRI recommends staying at a "health intensity": full breathing ease, to the point where you can hum a tune during the workout. The same rule applies on race day.

Here is a sample week, to adjust to your schedule:

Open water swimming: the main point of caution

Swimming in a pool and swimming in a lake or the sea are not the same: no lane line on the bottom, no wall, swell, and other people around you. This is also where the serious incidents recorded in the United States are concentrated.

A U.S. study published in the Annals of Internal Medicine compiled 135 cases of sudden death, resuscitated cardiac arrest, and traumatic death among triathlon participants from 1985 to 2016. The average age of the victims was 46.7 years, and 85% were men. Sudden deaths and cardiac arrests happened mostly during the swim: 90 cases, compared with 7 on the bike, 15 on the run, and 8 during recovery after the finish.

The study counts cases, not rates. Without the number of participants, it doesn't say swimming is dangerous for everyone, but that this is where it all plays out.

What you can do: don't discover open water on race morning, and swim the planned distance at least once in a pool before race day.

Signing up for your first race in France in 2026

To enter a federation race, there are two options.

• The annual license from the FFTRI, if you plan several races in the season.
• The Licence Expérience, new for 2026. It replaces the Pass Compétition: it is a one-race participation pass for non-licensed athletes, with the same insurance coverage and the same referee rules.

The price of the Licence Expérience depends on the race, and the race entry fee is extra. You can only buy it through a registration site labeled by the FFTRI or through the Espace Tri platform, so go through the registration page of your race.

Another change makes things simpler: the FFTRI no longer requires a medical certificate for adults. You still need to read and approve the points on the Info Santé form. Many pages still say otherwise, so trust the federation.

Gear: what can wait

For your first triathlon, Swiss Triathlon says you don't necessarily need a one-piece tri suit or a racing bike. Start with what you have.

• The wetsuit is not a starter purchase. It can be mandatory, allowed, or banned depending on the water temperature and the rules applied, so check your race rules.
• The bike needs to be in good working order.
• The helmet is mandatory when you ride: chin strap fastened and adjusted whenever you touch the bike, including when you walk it through the transition area.

Everything else (wheels, aero bars, a dedicated watch) can wait until your second season.

What you can do this week

1. Pick your race: an XS or S that's far enough away that you can fit in three workouts a week without overdoing it, after you check its exact distances.
2. Book a doctor's appointment for a check-up, as Swiss Triathlon recommends.
3. Schedule your three workouts in your calendar, one per sport, with a 10-minute warm-up and a 5-minute cool-down.
4. Swim the race distance once in a pool (400 m / 0.25 mi for an XS, 750 m / 0.47 mi for an S), then test open water with someone.
5. Stay at health intensity: if you can no longer hum a tune, slow down.

ELYO reads your watch workouts and analyzes them: pace, heart rate, volume, and consistency. You can quickly see whether you're keeping your three workouts a week and whether your workouts stay at the planned easy effort.

Written with the help of AI.