Hyrox wall balls: technique, breathing and how to break the 100
100 wall balls, 4kg for Open women to a 2.70m target or 9kg for Open men to a 3.00m target, after 7 stations and 8km of running. Hyrox wall balls are the last thing standing between you and the finish, and they're where the race gets decided for most people in the middle of the pack.
The station rewards two things that are hard to train together: a squat pattern that survives fatigue, and a breathing rhythm you can hold when your legs have already gone.
Why the last station is the hardest one
A wall ball is a full squat followed by an overhead throw. That's a large muscle mass firing repeatedly, with the arms held above the heart for a good chunk of each rep. Shoulders sit above heart level, blood flow to the working arm muscles gets harder, and your heart rate climbs faster than the effort seems to justify. The burn that comes with it is hydrogen ion accumulation, and buffering the burn is covered separately.
Add the depth requirement. Hip crease below the knee, every rep, judged. That's 100 full-range squats on legs that have already done a sled push, a sled pull, 80m of burpee broad jumps, 100m of lunges and 8km of running. Depth is the first thing to go, and a no-rep costs you the rep plus the one you have to do again.
Pacing decides this station far more often than strength does. If you can do 30 unbroken fresh, you can probably do 100 in sets of 10 to 15 at the end of a race. The gap between those two numbers comes down to how you manage the first 30 reps.
The technique that holds up when you're wrecked
Catch high, absorb into the squat. Take the ball around chest height with soft elbows and let it ride down with you. Catching low and then trying to reverse the momentum wastes energy on every rep.
Elbows in, ball on the chest. If the ball drifts away from your body at the bottom, your back does the work your legs should be doing. Keep it tight to the sternum.
Stand fully, then throw. The throw comes from hip and leg extension, with the arms guiding rather than pressing. If you're pressing the ball with your shoulders, you'll be done by rep 50.
Aim small. Pick a specific mark on the target and hit it repeatedly. Sloppy aim means chasing the ball, and chasing the ball at rep 80 is how people end up on their knees.
Feet slightly wider than your normal squat. A touch wider makes depth easier to find when your hip flexors are cooked.
Breathe on a fixed pattern
Free seconds live here, and they get thrown away constantly.
Pick a rhythm and hold it: breathe out on the throw, breathe in on the way down. One breath per rep, minimum. Two if you need them. What catches athletes out is holding the breath through the squat, a habit carried over from heavy lifting where bracing makes sense. Research comparing breathing techniques during resistance exercise found the Valsalva manoeuvre produced the highest blood pressure response of the methods tested. At rep 60 with the ball overhead, that shows up as a spiking heart rate and blurred vision.
If you find yourself holding your breath, drop to a set of 5 and reset the rhythm. Getting the breathing back is worth more than the 10 seconds it costs.
How to break the 100
Decide your sets before you get there. The reps you save by planning are worth more than any last-minute heroics.
Three patterns that work:
10 x 10. Consistent, predictable, easy to count when your brain has stopped working. Rest 10 seconds between sets. Best for first-timers.
20, 15, 15, 15, 15, 10, 10. Front-load while you still have something, then hold on. Best for athletes with a strong squat.
Descending: 25, 20, 15, 15, 10, 10, 5. Ugly on paper, honest about how fatigue actually works.
Whatever you pick, the rule is the same: rest by the clock. Feel will tell you to take 45 seconds. The clock says 10, and the clock is right. This is the same discipline that shows up in the rest of your race, and it's covered in more depth in our Hyrox pacing mistakes piece.
Training the station
Wall balls respond well to volume done under fatigue, and badly to volume done fresh.
Two sessions worth stealing:
Every minute on the minute, 12 rounds of 12 reps. Builds the rhythm and forces short rests. Add reps before you add rounds.
400m run, 25 wall balls, repeat 4 times. This is the actual test. Running first changes everything about how the squat feels, and it exposes whether your depth holds.
Also train the squat itself with a front-loaded bias. Goblet squats, front squats and tempo work build the position that fails first. And don't neglect grip and shoulders, because the forearms tend to fail earlier in a Hyrox than people expect.
The fuelling and hydration piece
By the time you reach wall balls you're 55 to 90 minutes in, sweating hard, and carrying a meaningful sodium loss. Cramping in the quads or calves at rep 70 is a common and preventable way to lose two minutes.
The ACSM position stand on exercise and fluid replacement is clear that you can't restore a fluid deficit without replacing sodium alongside the water. Work out your own sweat rate rather than guessing, and drink to that number in the days around the race. Electrolyte+ is £19.99 for 20 servings, which works out at £1 a serve, and it's the format we use ourselves in race week.
The wall ball station is the most trainable part of a Hyrox. It costs nothing to practise, needs one piece of kit, and gives back more time than almost anything else you could work on in the last six weeks before a race.