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Which HYROX Injury Is Yours, and What to Change in Training

Knee, back, shin or hip: match where it hurts and how it started to the HYROX sessions that load it, then the first training change and the signs that mean stop.

HYROX athlete seated on dark arena turf, one hand resting on a bent knee

A 2026 survey of 418 HYROX athletes, posted on medRxiv and not yet peer reviewed, found 49.8% reported at least one HYROX-related injury over the previous 12 months. In both that survey and a peer-reviewed 12-week cohort of 89 HYROX athletes, the knee was the most common injury site and shoulder injuries were few.

Most of that pain was the slow kind, and where it sits says more about your training week than about any single station. Match where it hurts and how it started, read your row, and make one training change. The HYROX training guide holds the wider plan.

Key Takeaways
  • Just under half of the 418 HYROX athletes in a 2026 survey (49.8%) reported a HYROX-related injury in the previous 12 months, according to a medRxiv preprint that has not been peer reviewed.
  • The knee was the most common injury site in both 2026 HYROX studies: 20.8% of the survey's most significant injuries and 22% of the episodes logged in a peer-reviewed 12-week cohort of 89 athletes.
  • The shoulder accounted for 4.1% of the most significant injuries in the 2026 HYROX survey and one of 63 episodes in a 2026 HYROX cohort, well below the 15% to 20% shoulder share repeated in search summaries.
  • Most HYROX injuries in both 2026 studies built up gradually: the survey recorded 57.4% gradual and 22.3% mixed onset, and the cohort classed 73% of injuries as overuse.
  • In the 2026 HYROX survey, training on more HYROX-specific days a week was the only measured factor independently linked to reporting an injury, though its authors say the design cannot show cause.
  • NHS guidance treats back pain with numbness in both legs, or with changes in bladder or bowel control, as an emergency, and an injury that will not take your weight as a reason for urgent advice.

What two HYROX injury studies actually counted

In every Open and Pro division, a HYROX race is eight rounds, each a 1 km run followed by one functional workout station. Training for it mixes running, station work and strength sessions, and both 2026 studies tried to measure what that mix does to the body. Neither reported which station hurt which region. They reported where it hurt, how it started and, sometimes, what the athlete was doing at the time.

A survey of 418 athletes, looking back 12 months

Ketzer and colleagues at TUM University Hospital in Munich surveyed 418 HYROX athletes online between February and May 2026. Their preprint, posted on medRxiv, has not been peer reviewed. An injury was any physical complaint the athlete linked to HYROX training or racing, whether or not it cost training time. 208 of 418 (49.8%) reported at least one in the previous 12 months.

For the most significant injury (197 athletes gave details), the knee led at 20.8%, then the spine or back at 15.2%, the lower leg at 13.7% and the hip or groin at 13.2%. By type, 41.6% were tendon-related. 57.4% came on gradually, 22.3% had a mixed onset and 20.3% were acute. For 20.3%, the injury meant more than 28 days of interrupted training or no return to the previous level yet.

Of the 205 most significant injuries with a recorded setting, only 37.1% happened in a directly HYROX-specific one (8.8% in competition), and 30.2% came from endurance training. Of the 76 injuries in HYROX-specific training or racing, 27.6% were tied to running and 11.8% to sandbag lunges. No other element passed five cases, and 30.3% could not be tied to any single element.

The authors flag their limits: self-report, a self-selected sample in which "injured or particularly engaged athletes may have been over-represented", mostly Germany-based respondents, and findings that "do not support specific training prescriptions".

A cohort of 89 athletes, reporting every week for 12 weeks

Chittenden and colleagues at the University of Bath followed 89 HYROX athletes (56 women) for 12 weeks using a validated weekly health questionnaire. Their paper is peer reviewed, in Frontiers in Sports and Active Living. 62% of the group had a year or less of HYROX experience, and the authors say the findings "should not be extrapolated to elite or long-tenured competitors".

In a typical week, 30% of the Bath cohort reported some health problem, illness included, and 13% an injury they put down to HYROX training. Of the 63 injury episodes, 73% were overuse. The knee had 22% of episodes. The lower leg and Achilles had only five episodes, all gradual, yet the highest average severity of any region. The elbow ranked third for burden on four episodes, because two persisted. The shoulder had one. Athletes kept training despite symptoms in around half of the weeks they reported a problem.

The authors' overall verdict: "On the evidence currently available, HYROX does not appear to carry a higher injury risk than the activities it combines."

Figures in circulation that neither study reports

Several figures repeated in search summaries and injury round-ups do not match either HYROX study.

  • Shoulder at 15% to 20%. The survey put 4.1% of most significant injuries at the shoulder (8 of 197), and 5 of the 44 second injuries athletes described; the Bath cohort recorded one episode in 63. The cohort authors note that other extreme conditioning programmes see far more, mostly from overhead barbell and gymnastic work.
  • Knee "up to 29%". The survey recorded 20.8% and the cohort 22%.
  • "Tendon overuse 42%". The survey's 41.6% is the share of tendon-related injuries across every body region. It is an injury type, not a lower-leg figure and not an onset figure.
  • "Risk up 61%" per step up in training frequency. The survey reported an adjusted odds ratio of 1.61 per training-frequency category. Its prevalence ratio, closer to what most people mean by risk, was 1.24, and the authors say the design precludes a causal reading.
  • "Most injuries happen in transitions". Neither study measured this.

First, how did it start?

The survey sorted injuries into three onset types. Use the same three to decide where to go next.

  • It built up over days or weeks (gradual or overuse, 57.4% in the survey). This is a load question. Go to your region in the table below.
  • It arrived in one moment (acute, 20.3%): one rep, one landing, one step, one twist. Read the stop signs further down first. If anything on that list fits, a clinician comes before the table. If nothing fits, take the session that caused it out of your next week rather than repeating it, and use the "Read next" page for your region. If it is getting worse or not getting better, NHS guidance points you to a GP.
  • A niggle that suddenly flared (mixed, 22.3%). Check the stop signs; if none fits, read your region as a build-up.

Onset also hints at what kind of session to look at, though the numbers here are small and both sets of authors call these comparisons exploratory. In the survey, injuries from endurance or HYROX-specific training were 78% lower-limb (90 of 116) and 65% gradual (75 of 116), while the 20 strength-training injuries were 45% spine or back and half acute. In the Bath cohort, half of the pelvis and lower back episodes started suddenly (3 of 6), against 4 of 14 at the knee.

Where it hurts, and what in a HYROX week loads it

Rows run from the highest survey share to the lowest, adding sub-regions where a row combines them (foot 8.1% plus ankle 7.1% is 15.2%, level with the back). Shares are of injured athletes who gave details: the knee's 20.8% is roughly 1 in 10 of all 418 respondents. Neither study linked a region to a station, so the third column is movement reasoning, matched to each station's technique guide, using the rules of every Open and Pro division; Adaptive divisions race adapted movements and distances.

Where it hurts What the two studies recorded What in a HYROX week loads it If it built up over weeks, change this first Read next
Knee Survey: 20.8%, the top region. Cohort: 22% of episodes, 71% gradual; running named for 5 of 9 with a recorded cause. Every run; the trailing knee touching the ground on each lunge; the hip crease dropping below the top of the knee on each wall-ball squat; single-leg drive on the sled push. Keep next week's running at this week's total. If knee pain only shows on lunges or wall-ball squats, cut the volume you added there before touching the runs. Running plan; sandbag lunges technique
Back or pelvis Survey: spine/back 15.2%, and 9 of the 20 strength-training injuries. Cohort: pelvis/lower back 10% of episodes, half sudden onset, mixed causes. Heavy lifts; the braced trunk on the sled push; the backward lean on the sled pull; lifting and setting down the farmers carry bells; the bag across both shoulders on the lunges. If back pain started in a lifting session, change that lift, not your HYROX volume. If it builds through sled, carry or lunge work, cut that station's volume in the session where it shows. Strength training; sled push technique
Foot or ankle (including under the heel) Survey: foot/toes 8.1% plus ankle 7.1%, 15.2% together. Cohort: foot 10% of episodes, 83% gradual, 4 training days lost across all 6; ankle 3 episodes, all gradual. Running; landing on both feet on each broad jump. Hold your weekly running total even if the pain never stops a session, and check your shoes suit the station work. If an ankle aches after jump practice, cut the broad-jump volume you added before the running. Shoes by station
Shin, calf, Achilles or back of the heel Survey: lower leg 13.7% (no separate Achilles count). Cohort: lower leg/Achilles 8% of episodes, all gradual, highest average severity of any region. Running, above all the first stretch after the sleds; the calves on every sled push step; two-footed take-offs and landings on the broad jumps. Treat it as a running-load signal: hold or reduce your running, and take run-after-sled repeats out of your week. Compromised running
Hip or groin Survey: 13.2%. Cohort: 11% of episodes, 71% gradual, mixed causes. Long lunge stretches; single-leg drive on the sled push; broad jumps; running; the deep wall-ball squat. Take out whatever you added most recently, whether lunges, broad jumps, running, sled push or wall-ball volume, one change at a time. Burpee broad jump technique
Thigh Survey: 6.6%. Cohort: 3 episodes. Faster running; explosive hip extension on broad jumps; the quads on the sled push and lunges. If thigh pain built up over weeks, take out the faster running or the extra lunge or sled volume you added most recently, one change at a time. A muscle that seizes and then lets go is a cramp, covered on its own page. Cramps
Elbow, forearm or wrist Survey: elbow 4.1%, wrist/hand 1.5%, forearm 0.5%, 6.1% together. Cohort: elbow 6% of episodes, third for burden as two persisted; every recorded cause was station or strength work. Hand over hand on the sled pull rope; the farmers carry grip; the SkiErg and rowing handles. Spread your hardest grip sessions further apart, and add no new ones. Grip strength
Shoulder Survey: 4.1% of most significant injuries (8 of 197). Cohort: one episode in 63. Covered station by station on its own page. Read the shoulder page before changing anything. HYROX shoulder fatigue

The survey's remaining 5.1% were mostly trunk and chest complaints, such as the ribs. Chest pain that comes with back pain is on the NHS emergency list in the stop signs below.

The five biggest regions, one at a time

The five regions with the largest survey shares, in table order. Every change here adjusts training; treatment is a clinician's job.

Knee: the one both studies put first

Check which pattern fits. Knee pain that aches at the start of every run and eases as you warm up points at the running total. Pain that only bites on the lunge descent points at lunge volume. Soreness the morning after a wall-ball session points at squat volume.

For the first, stop the running from climbing. For the lunge pattern, the sandbag lunges guide makes the case for a shorter stride: less descent to control, and a more reliable knee touch. Change one thing at a time so you can tell which one helped.

9 of the 14 knee episodes in the Bath cohort cost no training days, so knee pain that never stops a session still counts. Log it when it appears.

Back: check how it started first

If yours began during a heavy lift, that lift is the first thing to change. In the survey, the small group of strength-training injuries leaned towards the back and towards sudden onset.

If it builds across station work instead, check positions: a braced spine on the sled push, and a consistent backward lean on the sled pull, which is a hip and leg movement. Back pain that grows over sled and carry volume calls for less of that volume in one session.

The Bath authors name no specific prevention target for the pelvis and lower back, because the recorded causes were mixed.

Foot and ankle: the pain that rarely stops a session

Across six foot episodes in the Bath cohort, athletes lost four training days in total; the burden came from how long the pain lasted. Foot pain you can run through is easy to ignore for months. The cohort authors name running-volume progression as an untested target for the foot.

The ankle had three cohort episodes, all gradual. If yours aches after broad-jump practice rather than runs, cut the jumps first. Separately from either study, check your shoes: one built for road miles may not grip through a sled push.

Shin, calf and Achilles: few cases, long ones

The Bath cohort recorded only five lower leg and Achilles episodes, yet this region had the highest average severity of any. Watch for pain along the shin that builds over a week of running, calf tightness the morning after a sled day, or stiffness at the back of the heel at the start of a run.

All three point at running load first. Hold or reduce your running, and take run-after-sled repeats out of your week.

One exception: a sudden pop at the heel or calf belongs with the stop signs below, even if the pain eases.

Hip and groin: no single cause in the data

Neither study points to one cause: the Bath cohort's recorded causes split between running, station work and strength training, and the authors name no target. So work from your own log. If it aches after long lunge blocks, start there; if it flares after jumps or a faster run, look there. Remove the latest addition and give it a week or two before changing anything else.

The week-level pattern behind the regions

In the survey, HYROX-specific training frequency was the only measured factor independently linked to reporting an injury (adjusted odds ratio 1.61 per frequency category). Weekly HYROX hours and self-rated intensity fell away after adjustment. The authors note the link could run backwards, with injury changing training rather than the reverse.

Our practical reading, which goes beyond the study: count your HYROX-specific days, meaning simulations, station circuits and compromised runs, not only your hours. The HYROX training schedule covers how to space the expensive ones.

The Bath authors single out a time-loss injury in the previous 12 months, with a rate ratio of 2.60 for cumulative injury severity and an interval they call compatible with no association. They still conclude that "athletes returning from a recent injury warrant graduated reintroduction and closer monitoring." The International Olympic Committee's 2016 consensus, written about elite sport, says poor load management is a major injury risk factor, and counts rapid changes in load as part of load.

If the whole week feels heavy rather than one region, read the HYROX overtraining guide. If the pain followed a race, start from the HYROX recovery guide.

HYROX injury stop signs: when a clinician comes first

No article can examine you. Below are the signs, from NHS guidance, where the next step is a clinician.

Call 999 or go to A&E (NHS) if you have:

  • back pain with pain, tingling, weakness or numbness in both legs
  • back pain with loss of feeling around the genitals or anus, or changes in bladder or bowel control
  • back pain with chest pain
  • an injury where you heard a crack, the body part has changed shape or points at an odd angle, it is numb or tingling, or the skin around it looks blue or grey or feels cold

Get urgent advice from NHS 111, an urgent treatment centre or, for back pain, an urgent GP appointment (NHS) if:

  • you cannot put weight on it or walk more than a few steps
  • it is very painful or getting worse, or the swelling or bruising is large or growing
  • your knee locks, gives way or clicks painfully (the NHS notes painless clicking is normal)
  • you have an injury and a very high temperature, or feel hot, cold or shivery
  • your knee is red or hot and you have a very high temperature, or feel hot, cold or shivery
  • back pain is severe and started suddenly, or is getting worse quickly
  • shin pain is severe
  • you heard a snap, grinding or popping noise at the time of an ankle injury

See a GP or physiotherapist if:

  • knee pain has not improved within a few weeks
  • back pain does not improve with rest or is worse at night
  • shin pain keeps getting worse or is not getting better

Cambridge University Hospitals' Achilles rupture information describes a sudden heel or calf pain, sometimes with a snapping or popping sound, and notes that the pain "may then settle to a dull ache or it may go completely". Its care pathway for the injury begins "on presentation at A&E / Minor Injury Unit", so pain that eases after a sudden pop at the heel or calf should not reassure you on its own.

The NHS notes that in many areas you can reach physiotherapy through community musculoskeletal services without a GP referral. Outside the UK, use your local emergency number or urgent care; the signs are the same.

This page is training information. It does not diagnose or treat anything. In the 2026 survey, 71.1% of injured athletes sought at least one assessment or treatment, most often from a physiotherapist.

A trainer's view of lower-leg load

The personal trainer behind the Woodsy Workout channel opens by saying he is not a medical professional and that you should "speak to a specialist, get a proper diagnosis". His case: lower-leg injuries in HYROX training tend to be load-related, from "a lot of running, jumping and heavy sled pushes" rather than one bad rep. He goes on to demonstrate exercises; if you are injured, leave that choice to whoever examines you.

Frequently asked questions about HYROX injuries

How common are HYROX injuries?

Common. Just under half of the athletes in the 2026 medRxiv survey, which has not been peer reviewed, said they had a HYROX-related injury in the past year. In the peer-reviewed Bath cohort, 13% had an injury they linked to HYROX training in a typical week. Both studies counted complaints that did not stop training.

What is the most common HYROX injury?

The knee. It came first in both 2026 studies: 41 of the survey's 197 detailed injuries and 14 of the Bath cohort's 63 episodes. Running was the activity linked to injury most often in both studies, and most of the cohort's knee episodes built up gradually.

Why do my knees hurt after HYROX training?

Neither study reported which station caused which knee injury. In training, the knee works on every run, on lunges, where Open and Pro rules require the trailing knee to touch the ground, and on wall-ball squats. If the pain built up over weeks, hold your running total first, then look at lunge and wall-ball volume.

Why does my lower back hurt after HYROX?

The back was the survey's second most common region, at 15.2% of most significant injuries. Of its 20 strength-training injuries, 9 were to the spine or back and half of all 20 were acute. Before you cut sled or carry work, check whether the pain began in a lifting session.

Which HYROX station causes the most injuries?

Running, not a station. The 2026 survey linked 21 of the 76 injuries from HYROX training or racing to running and 9 to sandbag lunges; no other station had more than five. With counts that small, no station ranking is settled.

Is HYROX more dangerous than CrossFit or running?

Not on current evidence. Setting their injury rates beside published running, strength and CrossFit-style figures, the Bath authors judged that HYROX does not appear riskier than the activities it mixes. The survey's 49.8% was higher than the 35.3% mean in a CrossFit review but inside its range; its authors call such figures "reference points rather than direct comparisons of injury risk".

Do HYROX athletes get shoulder injuries?

Not often in the data so far: 8 of 197 most significant injuries in the 2026 survey, 5 of 44 second injuries, and one of 63 episodes in the Bath cohort. The HYROX shoulder guide covers how each station loads the shoulder.

Should I train through pain before a HYROX?

Many do: in the Bath cohort, training went on in about half of the weeks with a logged health problem. Slow-building pain is a reason to change the load on that region. A pop, a joint that will not take weight, or numbness needs a clinician first.

Can I race HYROX in a knee sleeve?

Yes. Knee sleeves are on the permitted equipment list in the Season 26/27 rulebook. If your knee is bad enough that you are asking, check the stop signs above before race day.

References