For your first HYROX, enter Open if racing solo or Doubles if racing with a partner: both use standard weights and are built for newcomers. Choose Relay for a social, mixed-ability team, and save Pro for experienced athletes who want heavier sleds, a heavier wall ball and stricter standards. The division you pick changes the training you owe the race, not the course itself.
- Open and Pro are solo over the full 8km; Doubles has both partners run all 8km while sharing station reps; Relay splits the course between four athletes.
- Pro raises the loads and standards versus Open, but the running distance is identical, so the difference is a strength difference, not an aerobic one.
- Division should shape your preparation months in advance, because it decides where your limited training time goes.
"Isn't Pro just Open but harder?" Not in the way you think
It is tempting to read Pro as a straight difficulty upgrade, but that framing hides the real mechanism. The running in Pro is the same 8km, so the aerobic demand barely moves. What jumps is the strength demand: heavier sleds and a heavier wall ball. The stations that already cost most athletes the most time simply get heavier. So the honest question is not "am I fitter than Open" but "can my strength endurance absorb the extra load without wrecking the runs that follow". A Pro sled that stalls you mid-station does not just cost you at the station; it empties the legs you needed for the next kilometre. That is the trade-off nobody mentions, and it is why almost every first-timer should race Open, learn pacing and standards, and earn a benchmark first.
How Doubles and Relay actually change the demand
Here is the objection worth sitting with: does a team format let you dodge the hard part? Partly, and honestly. In Doubles, two athletes share the reps at every station, splitting wall balls, lunges and carries, so the station workload nearly halves. But both partners still run all 8km, side by side, at a shared pace. It lowers the strength burden per person while keeping the running fully honest, which is exactly why it makes a forgiving first entry for a pair. Relay goes further, splitting the entire course across four athletes so each covers a fraction of both running and stations. That is the genuinely gentlest way in, and the trade you accept is that you never rehearse the full race demand.
Match the division to the athlete
| Division | Running | Station load | Best for |
|---|---|---|---|
| Open | 8km solo | Standard weights, full reps | First solo race |
| Pro | 8km solo | Heavier weights, strict standards | Experienced athletes with the engine and the strength |
| Doubles | 8km each | Shared reps between two | Pairs, first-timers with a partner |
| Relay | ~2km each | Split across four | Mixed-ability teams, social entry |
How your division should change your training
This is where the choice stops being an entry form and becomes a programming decision. Open and Pro solo athletes must train the full 8km of compromised running, because they carry the entire race alone; the aerobic base is non-negotiable. Doubles athletes still need that full running base but can train station work knowing reps will be shared, which permits a slightly heavier strength focus per rep. Relay athletes should train their specific leg hard, often a shorter, faster effort, rather than the full-distance grind. Pro athletes need the same engine as Open plus meaningfully more strength to move heavier sleds and the heavier wall ball without stalling. Match the training to the division and you stop over-preparing for demands you will never face.
"We steer almost every first-timer to Open or Doubles. You learn the roxzone, the pacing and the station standards once, then you have a real benchmark to chase. That's worth far more than an ego entry into Pro," says the THETA coaching team.
What choosing a division will not fix
Be clear about the limit here: no division makes you a better athlete on its own. Pro is a category, not a badge of fitness, and picking it before you are ready usually produces a slower result, not a prouder one, because the race is decided far more by compromised running and the roxzone than by any single heavy station. Equally, Doubles or Relay will not build the engine for you; they lower the load, not the need to train. Choosing the right division removes an unnecessary obstacle. It does not remove the work.
How to decide your first division
Work through your situation in order rather than defaulting to whatever your friends picked.
- Racing alone with no HYROX experience? Choose Open.
- Racing with one committed partner of similar fitness? Choose Doubles.
- Assembling a group with mixed fitness levels? Choose Relay.
- Already finished an Open race, posted a competitive time, and can move Pro loads without stalling in training? Consider Pro.
- Unsure about the running volume? Doubles or Relay reduce the standalone pressure.
Availability and transfers depend on the specific event, and popular divisions frequently fill first, so treat the choice as a training decision made early rather than a race-week afterthought.
Because the right training genuinely differs by division, this is where a plan should ask which one you are racing. Tell THETA BLUEPRINT your division and it weights running against shared or solo station work accordingly, built from a 2-minute assessment, so a Relay leg and a solo Pro build never look the same. The first week of every block is free. Build my plan.
Common questions
Should my first HYROX be Open or Pro?
Your first HYROX should almost always be Open. It uses standard weights and lets you learn pacing and station technique, whereas Pro's heavier sleds and wall ball and stricter standards are best attempted once you have a completed race and a benchmark time behind you.
Is Doubles easier than Open?
Doubles reduces station workload because two athletes share the reps, but both partners still run the full 8km. It feels easier at the stations and harder to coordinate on pacing, so it is a great first entry for pairs but not a way to avoid the running demand.
How is Relay different from Doubles?
In Relay, four athletes split the entire course so each person handles only a portion of the running and stations, while in Doubles two athletes both run all 8km and share only the station reps. Relay is the more social and beginner-friendly of the two.
What weights does Pro use compared with Open?
Pro uses heavier sleds and a heavier wall ball than Open, alongside stricter standards. Open is designed as the accessible standard-weight division, so the jump to Pro is significant and best reserved for experienced athletes.
Does racing Pro make me fitter than Open?
No. Pro is a category, not proof of fitness, and the largest and often most competitive fields sit in Open. Because the race is decided largely by compromised running and the roxzone, entering Pro before your engine and strength are ready usually produces a slower time.
Can a mixed-ability group race together?
Yes, Relay is built for it, because each of the four athletes covers only part of the course. Stronger members can take larger portions while less experienced members still get the full race atmosphere without carrying the entire distance.
Sources
- HYROX official divisions, format and rulebook (hyrox.com)
- THETA coaching data, 2024-2026
- Established principles of progressive competition entry and load management