Does Hyrox Make You a Better Triathlete?

If you train in a commercial gym, you've probably seen people pushing sleds and throwing wall balls between treadmill runs. Hyrox, a standardised indoor fitness race, has grown quickly since the first event in 2017, and many triathletes now wonder whether it's a good way to spend the winter, or even a useful part of a triathlon build.

It is easy to see the appeal. Hyrox combines running with strength-based stations, which sounds like the running and strength work triathletes are told they need. It is indoors, it happens in winter, and it has the competitive edge that many triathletes miss in the off-season.

This article covers what Hyrox actually demands, according to the small amount of research available, what might transfer to triathlon, what certainly doesn't, and how to fit it in. The honest headline: the physiology is starting to be described, but nobody has tested whether Hyrox training makes anyone a better triathlete.

What Hyrox is

A Hyrox race always follows the same format, which is one reason researchers find it interesting. According to the Methods of the 2025 study described below, a race consists of eight 1,000 m runs, each followed by a workout station. In the Individual Open division, the stations in order are:

1. SkiErg: 1,000 m.
2. Sled push: 4 × 12.5 m (102 kg for women and 152 kg for men, including the sled).
3. Sled pull: 4 × 12.5 m (78 kg for women and 103 kg for men, including the sled).
4. Burpee broad jumps: 4 × 20 m.
5. Rowing ergometer: 1,000 m.
6. Farmers carry: 8 × 25 m with two kettlebells (16 kg each for women, 24 kg each for men).
7. Sandbag lunges: 4 × 25 m (10 kg for women, 20 kg for men).
8. Wall balls: 75 repetitions with a 4 kg ball for women, 100 with a 6 kg ball for men.

The same paper's introduction gives slightly different sled loads without explaining the difference, so check the current rulebook for your division. The study also reports that around 90,000 athletes took part in the 2022/23 season, citing another source.

The key study: what a Hyrox race demands

The only published physiology study of a full Hyrox race is a 2025 paper by Brandt and colleagues in Frontiers in Physiology.

• Participants: 11 recreational Hyrox athletes, 27% of them women (3 of 11), with a median age of 33 (range 23 to 43) and a median of 18 months' Hyrox experience.
• Fitness: median VO2max of 51 ml/kg/min.
• Protocol: after fitness testing, they completed a simulated Individual Open race 48 hours later. Heart rate was recorded throughout, and blood lactate and perceived exertion were measured after every run and station.

The results:

• Total time was 86.5 minutes. The runs took 51.2 minutes and the stations 32.8 minutes.
• The race was very hard throughout. Athletes spent a median of 79.5% of the race at 90 to 100% of maximum heart rate and 19.6% at 70 to 90%.
• The stations were the most metabolically stressful part. Peak blood lactate was higher after the stations (8.5 mmol/L) than after the runs (7.7 mmol/L), and peak perceived exertion was higher too (18 versus 16 on the 6 to 20 scale).
• Wall balls, the final station, produced the highest heart rate, lactate and exertion.
• The heaviest stations were among the fastest. The sled push took around 128 seconds and the sled pull around 155 seconds.

The most interesting finding for triathletes is what predicted performance:

• Higher VO2max was associated with faster finishing times (Spearman's rho −0.71).
• More endurance training was associated with faster finishing times (rho −0.68).
• Resistance training volume and hand-grip strength weren't significantly associated with finishing time (rho 0.34 and 0.09).

The authors concluded that Hyrox is a high-intensity functional fitness format with an emphasis on endurance capacity and relatively low demands on maximal strength, coordination and mobility.

The limitations matter. It was 11 people, mostly men, all recreational. The runs were on a treadmill rather than a track, the sled wasn't the official one, the athletes raced alone without competitors or a crowd, and strength was measured only with grip strength, so lower-body strength wasn't tested directly. Correlations in 11 people can't show cause and effect.

The wider evidence: small and early

A narrative review by Tibana and colleagues, posted as a preprint in July 2026 and not yet peer-reviewed, gives a sense of how young this research area is. Searching three major databases, it found 11 studies in total: 8 original studies and 3 reviews. According to the review:

• Running capacity consistently emerged as the strongest determinant of overall Hyrox performance, including in an analysis of competition results from 39,696 athletes (Rappelt and colleagues, 2026, as summarised by the review; TriForward hasn't read that paper directly).
• Functional stations produced particularly high blood lactate.
• Injury, recovery and sleep remain largely unstudied. The only injury data come from a self-reported survey of 80 Hyrox athletes (22 women and 58 men), in which 56.3% reported no injuries and overuse injuries and tendon problems were the most common complaints.
• Most evidence is observational, drawn from race results rather than training studies.

Two consistent messages emerge. Hyrox is mostly a running and aerobic event. And no one has yet run a controlled trial of Hyrox training for any outcome, let alone triathlon performance.

What might transfer to triathlon

Since no study has tested transfer, everything in this section is inference from the physiology above and from general cross-training research.

• Running fitness. Over half of a Hyrox race is running, so Hyrox training includes a lot of running. If that running is extra to your normal volume, it is likely to help your run like any other running would.
• Running on tired legs. Hyrox runs start immediately after leg-heavy stations, which resembles running off the bike in a loose way. TriForward's "The Bike-to-Run 'Brick' Problem" covers what the brick research shows. Inference: the fatigue is different, coming from short, intense strength work rather than hours of cycling, so the transfer is uncertain.
• Strength endurance. Sleds, lunges and carries build the ability to keep producing force under fatigue. Whether this improves durability late in a long race hasn't been tested.
• Motivation and consistency. An indoor race in the winter can keep you training when you otherwise wouldn't. That is a real benefit, even if it is hard to measure.

What doesn't transfer

• Swimming. Nothing in Hyrox trains your swim. Millet and colleagues' 2002 modelling study of 4 elite triathletes followed over 40 weeks found that cycling and running training transferred to each other, but swimming training didn't transfer to or from either.
• Cycling. Hyrox doesn't include cycling. Some general fitness will carry over, but a 1994 review of cross-training by Tanaka concluded that while some transfer of VO2max gains exists between activities, cross-training effects never exceed those of sport-specific training.
• Long, steady aerobic work. Triathlon, especially at long distances, is mostly performed at moderate intensity for hours. Hyrox is about 90 minutes at very high intensity. These are different demands.
• Heavy strength. The stations involve moderate loads for many repetitions. The strength training with the best evidence for cycling and running economy, covered in this batch's "Heavy Lifting for Bike Power" and in "Gym or Home?", uses heavy loads for few repetitions. Inference: Hyrox training doesn't replace a heavy strength programme.

The interference question

Triathletes worry that combining endurance and strength training will blunt the gains from each. A 2022 meta-analysis by Schumann and colleagues in Sports Medicine pooled 43 studies comparing strength training alone with strength plus aerobic training.

• Maximal strength wasn't significantly reduced by adding aerobic training (standardised mean difference −0.06).
• Muscle growth wasn't reduced (standardised mean difference −0.01).
• Explosive strength gains were reduced (standardised mean difference −0.28), more so when both types of training were done in the same session.

This batch's "Lifting and Endurance in the Same Week" covers this in more detail. Inference: Hyrox mixes strength and endurance within the same session, which is the condition under which explosive-strength gains were most affected. For a triathlete, that probably matters less than the bigger issue: Hyrox adds a very hard session to a week that is already demanding.

How Hyrox running compares with a triathlon run

On paper, Hyrox and triathlon both finish with running on tired legs, but the running itself is quite different.

• Distance and structure. Hyrox has 8 km of running in total, broken into 1 km pieces with a station between each. An Olympic-distance triathlon finishes with a continuous 10 km run, and an Ironman with a marathon.
• What comes before. In Hyrox, each run follows a few minutes of intense, mostly leg-heavy strength work. In triathlon, the run follows a long, steady bike leg, and the fatigue builds over hours rather than minutes.
• Intensity. In the Brandt study, most of the race was spent above 90% of maximum heart rate. Most age-groupers race long-course events well below that, and even an Olympic-distance race lasts two hours or more for many of them.
• Pacing skill. Hyrox rewards holding back on the early runs so you can survive the later stations. Triathlon rewards the same discipline over a much longer time frame. TriForward's "Racing by Feel vs. Racing by Numbers" covers the pacing research.

Inference: a Hyrox run is closer to a hard interval session than to the run leg of a triathlon. That can still be useful training, but it isn't race-specific practice for most triathletes, particularly at long distances.

Women and older athletes

The evidence base is especially thin here. The Brandt study included only 3 women, and the oldest participant was 43. The survey summarised in the Tibana review included 22 women. The loads in the Open division differ by sex, but nobody has studied whether women or masters athletes respond differently to Hyrox training or racing. Inference: older athletes, who typically need longer to recover from very hard efforts, may want more easy days around a Hyrox race than younger athletes. This batch's "The Masters Training Week" covers recovery and intensity after 50.

Where Hyrox fits in a triathlon year

The following suggestions are inference rather than tested advice.

1. The off-season is the natural fit. A winter Hyrox gives you a goal at a time when there's no triathlon to aim for and you're likely to be doing more gym work anyway. TriForward's "The Off-Season" covers how much rest to take first.
2. Treat a Hyrox race as a hard effort, not a training session. At around 80% of the race above 90% of maximum heart rate, it is likely to need several days of easier training afterwards.
3. Keep heavy strength training separate. If you're doing Hyrox, maintain one heavy lower-body session as well, rather than assuming the stations cover it.
4. Keep swimming and cycling going. Hyrox fitness won't maintain your swim or your bike.
5. Avoid Hyrox in the final weeks before a key triathlon. A very hard, unfamiliar effort close to your main race risks soreness and fatigue for little gain.
6. Build station volume gradually. Wall balls, lunges and sled work at race volume can cause substantial soreness if you're not used to them. TriForward's "Sore From the Gym, Flat on the Bike" covers how to manage that.

A triathlon scenario

The following example is illustrative, not drawn from a study. A 38-year-old woman races Olympic-distance triathlon in the summer and usually loses motivation in the winter. Her gym is running a Hyrox simulation in February, and she's thinking of entering a race in March.

Based on the evidence above, she might:

• Enter the March race as her winter goal, keeping her triathlon season's key race in July.
• Do one Hyrox-style session a week from December, building the station volume over several weeks.
• Keep two swims, two rides, and one heavy lower-body strength session each week, with some of her running replaced by the Hyrox runs.
• Take a few easy days after the race before starting her spring triathlon build.

Common mistakes

• Treating Hyrox as a strength programme. The race rewards aerobic fitness, and the stations are mostly strength endurance, not heavy strength.
• Doing Hyrox-style sessions on top of every other hard session. Total load matters more than the label on the session.
• Dropping the swim and bike for the winter and expecting Hyrox fitness to carry over.
• Going straight to race volume on wall balls, lunges and sled work.
• Racing Hyrox close to a key triathlon.

What we don't know

• Whether Hyrox training improves triathlon performance. No study has tested it.
• How Hyrox athletes get injured, beyond one self-reported survey.
• How much recovery a Hyrox race needs, and how that compares with a hard triathlon training session.
• Whether the findings apply to women and older athletes, since the lab study had 3 women and no one over 43.

References

• Brandt T, Ebel C, Lebahn C, Schmidt A. Acute physiological responses and performance determinants in Hyrox© – a new running-focused high intensity functional fitness trend. Frontiers in Physiology, 2025;16:1519240. doi:10.3389/fphys.2025.1519240
• Tibana RA, Rios MJ, Dominski FH, Prestes J. Hyrox®: current evidence on physiology, psychology and performance determinants. Preprints, 2026 (preprint, not peer-reviewed). doi:10.20944/preprints202607.1912.v1
• Schumann M, Feuerbacher JF, Sünkeler M, Freitag N, Rønnestad BR, Doma K, Lundberg TR. Compatibility of concurrent aerobic and strength training for skeletal muscle size and function: an updated systematic review and meta-analysis. Sports Medicine, 2022;52(3):601–612. doi:10.1007/s40279-021-01587-7
• Tanaka H. Effects of cross-training: transfer of training effects on VO2max between cycling, running and swimming. Sports Medicine, 1994;18(5):330–339. doi:10.2165/00007256-199418050-00005
• Millet GP, Candau RB, Barbier B, Busso T, Rouillon JD, Chatard JC. Modelling the transfers of training effects on performance in elite triathletes. International Journal of Sports Medicine, 2002;23(1):55–63. doi:10.1055/s-2002-19276