HYROX Doubles vs. Singles vs. Relay: Which Should You Sign Up For?

Signing up for the wrong format is the most common regret among first-time HYROX athletes — usually people who chose doubles believing it would be half the work, then discovered they still had to run every metre.

Here is what each actually demands.

One caveat before anything else: HYROX rules, weights and rep counts change between seasons and vary by division. Everything below describes the shape of each format. Check the current official rules before you plan a race around specifics.

Singles

What it is. You do the whole thing. Eight 1 km runs, eight stations, alone.

What it tests. Your aerobic base, above all. There is nowhere to hide — no recovery while a partner works, no shared load. The race is a continuous 60 to 110 minute effort and it will find whichever quality you have neglected.

Who it suits. Anyone who wants the real benchmark. It is also, counterintuitively, a very good first-race choice: pacing is simpler when you only have yourself to manage, and there is no pressure of letting someone down.

The hard part. Runs three and four, immediately after the sleds, when your legs are ruined and there are still five stations to go.

Doubles

What it is. Two athletes. You both run all eight kilometres, together. The station work is shared between you — the pair completes the total reps, splitting them however you choose, tagging in and out. Loads on some stations are heavier than singles to reflect two people working.

The misconception. "Doubles is half the work." It is not. You run 100% of the running. The running is more than half the race. You share only the station portion.

What it actually changes. Because your station time drops substantially — you are resting while your partner works — you arrive at each run considerably fresher than a singles athlete would. Which means you run faster. Which means, for a lot of people, doubles is harder per kilometre than singles, even though the total time is lower.

If you have been imagining a gentler day out, adjust that expectation now.

What it tests. Running speed under moderate fatigue, and communication. Good pairs have a plan for every station — who starts, what the split is, how they call the swap — and lose almost nothing in transitions. Bad pairs stand around negotiating mid-station.

Who it suits. Two athletes of reasonably similar running ability. That last part matters more than anything: doubles is limited by the slower runner, because you run together. A strong lifter paired with a strong runner is not the complementary team it sounds like — the lifter's running will set the pace for 8 km.

The hard part. Running faster than you would alone, for the full distance.

Relay

What it is. Four athletes. Each takes a portion of the course — typically two runs and two stations each.

What it tests. Repeatable short efforts. Your section is short enough to attack, which changes the whole character of the day: it is a series of hard intervals rather than an endurance event.

Who it suits. Groups with mixed fitness. It is the format where a very fit person and a less-trained friend can both have a good race, because you can allocate sections to strengths. It is also the most fun by a clear margin, and the best introduction to the sport for someone who is not sure they want to do this at all.

The hard part. Going hard enough. The temptation is to pace yourself as though you had the whole race, then finish your section wondering why you were not more tired.

Choosing

Pick singles if you want the benchmark, you are training alone, or you want a number to improve on.

Pick doubles if you have a partner with similar running ability and you both want a faster, sharper race. Train together at least a few times — the swaps genuinely need rehearsing.

Pick relay if you are getting a group in, the fitness levels vary, or you want to try the sport without committing a training block to it.

If it is your first race

Any of the three is a reasonable entry point, and the honest recommendation depends on why you are doing it.

Doing it to test yourself → singles. Doing it with a training partner who runs like you do → doubles. Doing it because four of you signed up after a few drinks → relay, and you will have the best day of the three.

Whatever you choose, the preparation looks broadly the same, and it is mostly running. The 12-week first-timer plan works for all three formats — for doubles, add sessions with your partner so the handovers are rehearsed rather than improvised.