How much running do you need for HYROX?

Nobody has tested a weekly running number for HYROX. The closest thing to evidence is one small study in which athletes with more endurance training hours finished faster, and a big results analysis showing running is about half of race time. So there's no magic number. Run as much, mostly easy, as you can recover from while your lifting holds up.

Below is what the research actually measured, and then exactly what I ran in the eight weeks before my first race.

What the studies actually measured#

One lab study has looked at what predicts HYROX time. Brandt and colleagues put 11 recreational athletes through a full simulated Open race, with the runs on a treadmill, and correlated their finish times with everything they'd measured¹. VO2max had the strongest link with a faster finish (rho -0.71). Weekly endurance training hours came next (rho -0.68). Grip strength and weekly resistance training hours showed nothing meaningful.

What tracked HYROX finish time (Brandt 2025, n = 11)

	Value (rho)
VO2max	-0.71
Endurance training hours	-0.68
Body fat %	0.67
Resistance training hours	0.34
Grip strength	0.09

Spearman correlation with total finish time; negative means a higher value went with a faster finish. Source: Brandt et al., Front Physiol 2025, simulated Open race.

Read that chart carefully. Eleven people is tiny, it's a correlation, and it measured hours of endurance training, not kilometres of running. The group's median was only 3 hours of endurance work a week, with a range of 2 to 7¹. It tells you the engine matters. It doesn't tell you how many kilometres build one.

The bigger data points the same way. Rappelt and colleagues went through about 40,000 Pro and Elite results across seven seasons. Running was roughly 50% of total race time in every season, and most of the improvement at the top came from faster running². That's Pro and Elite only, so treat it as the direction of travel, not your split.

A 2026 narrative review pulled together the 11 HYROX studies that exist and landed on the same thing: running capacity is the strongest determinant found so far, and the evidence is still thin and mostly observational³. That review is a preprint and hasn't been peer reviewed yet.

What intensity HYROX running is#

In a study of 24 Pro men racing HYROX Madrid 2025, average running speed across the eight runs and the Roxzone was about 84% of their speed at the second ventilatory threshold, and about 76% of the speed at which they hit VO2max⁴. And the athletes with the shortest running times held a higher fraction of it.

Here's what that looks like as a pace. Say your threshold pace is 4:30 per km, which is about 13.3 km/h. Holding 84% of that speed is about 11.2 km/h, or roughly 5:21 per km averaged over the runs and the Roxzone. That's arithmetic on the Pro average, not a target for you, but it shows the shape: race running is clearly slower than threshold pace, and the people who finish faster hold a bigger fraction of it.

One more detail from the same study: those Pro men averaged a VO2max of 51.6 mL/kg/min⁴, close to the median of 51 in Brandt's recreational group¹. Different labs and different tests, so don't read much into the comparison. It's still a useful reminder that VO2max isn't the whole engine. How much of it you can hold, and for how long, matters too.

So race running sits below threshold, but not far below, for over half an hour, with sleds and lunges in between. That's a sustained-aerobic job. The training that supports it is mostly easy volume with some threshold work, which is roughly how endurance athletes already train: descriptive studies of national and international level athletes find about 80% of sessions at low intensity and 20% hard⁵. Whether that split is the right one for someone who also lifts four times a week hasn't been tested in HYROX athletes.

How much of the race is running#

Half, give or take, depending on who's racing and where. Among top-100 Pro men the share sat between 47% and 51% of total time across seven seasons². In Brandt's simulation it was more like 59% (51.2 of 86.5 minutes), with the runs on a curved treadmill instead of a race course¹.

My Bangkok race split almost exactly in half between running and stations, with the Roxzone on top⁶:

Where Ken's 1:13:38 went

	Runs (min)	Stations (min)	Roxzone (min)	Total (min)
Bangkok 2026	33.23	33.65	6.75	73.63

HYROX Bangkok 2026, Men. Runs 33:14 (45%), stations 33:39 (46%), Roxzone 6:45 (9%). Source: HYRESULT result page.

That's why "how much running" is the wrong first question if you've never raced. Running is about half the clock. The other half is stations and walking between them, and if you came to HYROX from lifting, the running half may well be where most of your time is. If you came from running, it may be the stations. Look at your own split, or your own training, before you decide.

What I actually ran before Bangkok#

Here's my logged running for the eight weeks before HYROX Bangkok on 14 August 2026, straight from my training log. Weeks run Monday to Sunday.

Not counting race week, that's 124 km in eight weeks, 15.5 km a week on average, and never more than 26 km in a week. The longest single run was 15.1 km on 2 August. On top of it there was about 4 hours a week of indoor cycling, and roughly 16 km of extra running inside HYROX circuits that isn't in the table, in 500 m to 1 km reps between stations.

Ken's eight weeks before HYROX Bangkok

	Running (min)	Cycling (min)	Total (min)
15 Jun	21	273	294
22 Jun	27	102	129
29 Jun	83	300	383
6 Jul	143	211	354
13 Jul	119	120	239
20 Jul	99	302	401
27 Jul	140	316	456
3 Aug	32	321	353

Logged running and indoor cycling minutes per week, Monday to Sunday, 15 June to 9 August 2026. Source: Ken's hybridAF training log, read 2026-10-22.

Before that block I'd been running a lot more. From early April to mid May my weeks were 29 to 39 km. Then on race day my eight runs added up to 33:14, ranked 127th of 3,254 men in Bangkok, which HYRESULT puts in the best 10% of its all-seasons results⁶. My stations were 33:39, ranked 406th.

That doesn't prove much, and it'd be easy to oversell. It's one athlete, with a running base built months earlier and a lot of bike hours on top of thin running weeks. The fair reading is narrower: the race-day running wasn't built in those eight weeks alone, and total aerobic work (running plus cycling) was a lot higher than the running column suggests. That at least fits Brandt's finding, where it was endurance training hours, not running kilometres, that tracked finish time¹.

How to work out your own number#

Start with what your legs can absorb next to your lifting, not with a target from a forum. A practical way to set it:

1. Take what you ran in your last four normal weeks. That's your floor.
2. Make most of it easy, conversational running. HYROX is half running and the race pace sits below threshold, so easy volume is where the base comes from.
3. Add one session a week that looks like the race: 1 km repeats near your goal race pace with short rests, or runs straight off a station. The compromised running guide has two formats for that.
4. Add volume slowly, and only while your lifts are holding. If heavy leg days start to wreck your runs, move them apart before you cut either one. The hybrid week split guide has templates for 3 to 6 days.

Fitting the runs around your lifting#

The practical problem for most people isn't the kilometres. It's where they go in a week that already has three or four lifting sessions in it.

A simple shape to start from: one longer easy run, one race-specific session (the 1 km repeats or a brick), and one or two short easy runs. That's three or four runs, and the only hard one is the race-specific session. Put that one on a day away from your heaviest leg work, because a hard lifting session can take the quality out of an endurance session that follows it for hours or even days⁷. The easy runs can sit next to lifting days; they're easy for a reason.

My own July weeks looked roughly like that, if messier: one run of 8 to 10 km most weeks, a 15 km run on 2 August, and HYROX circuits on one to four days a week, some with 500 m to 1 km runs built in. The bike did a lot of the extra aerobic work.

If you're short on time, the long easy run and the race-specific session are the two to protect. If you're short on recovery, drop the race-specific session before the easy volume, because the easy volume is what the base is made of.

There's no study behind the exact steps above, and a review of the distance-running literature says direct evidence for most training recommendations is limited even for pure runners⁸. They're a sensible default built on the two things the evidence does support: the engine predicts HYROX time, and most endurance training is easy.

If your running is already decent and your stations aren't, more kilometres probably isn't your fix.

My runs were in the top 10% of HYRESULT's all-seasons data and my stations around the top third, which reads as a station problem, not a running one. My plan after Bangkok was exactly that: next block, the barbell gets the hours. The Hybrid Score calculator grades both halves on one ladder if you want to see which side is behind before you decide where the hours go.

For pacing the eight runs on the day, read how to pace the HYROX runs. For building the engine without giving up the barbell, see raising VO2max while lifting. Everything HYROX is linked from the HYROX hub. hybridAF is not affiliated with HYROX.