Do you need electrolytes for HYROX?

Usually yes, more than you'd think. HYROX is 60–90 minutes of near-threshold effort, often in a hot, crowded venue, so sweat losses are high. A salty sweater can lose more sodium in that hour than a single gel or sports drink replaces. How much you need depends on your own sweat rate and saltiness, which vary about tenfold between athletes.

What should I drink during a HYROX race?

Most of the work is done before and after — you can't drink much mid-race between stations. Arrive well hydrated with sodium on board, sip what you can, and replace to your measured losses afterward. Because it's an hour, not four, over-drinking is less of a risk than under-replacing sodium for a salty sweater.

HYROX hydration & electrolytes

An hour at threshold, in a hot hall — you sweat a lot.

HYROX packs 60–90 minutes of near-threshold work into a warm, crowded venue. That's a genuinely heavy-sweat hour, and a salty sweater can lose more sodium than a gel replaces. Short enough that over-drinking isn't the danger — long and hard enough that under-replacing sodium is. Here's how to dose it to your own sweat.

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Why HYROX is a sodium event, not just a water one.

Two things stack up. First, the effort is high and near-continuous — eight runs alternating with eight heavy stations means you're rarely recovering. Second, the venues are hot and humid with a few hundred bodies in them, which pushes your sweat rate up further. Over an hour that adds up to real fluid and sodium loss — and because sweat sodium varies about tenfold between athletes (roughly 200–2,000 mg/L), a one-size tab is a guess. The salty sweater in the heat is the one who fades on the last 1 km or seizes on the wall balls.

The good news vs a marathon: at ~60–90 minutes you can't over-drink your way into hyponatremia the way slow marathoners can — there's simply no time. So the job is simpler: arrive topped up with sodium on board, and replace what you lose afterward. The failure mode here is almost always too little sodium, not too much water.

The protocol, front-loaded.

You can barely drink mid-race, so the work happens on either side of it:

Day beforeHydrate normally, with salt on your food. Going in low is the deepest hole; you can't fix it in the warm-up.

Pre-racePre-load fluid with sodium 60–90 min before — a measured dose in ~16 oz primes you for a sweat you can't drink through.

DuringSip what you can at the rig if it's offered. Don't force it; you're topping up, not catching up.

AfterReplace to your number. This is where most of the sodium goes back — your calculated dose in water, over the next hour.

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An hour at threshold, in a hot hall — you sweat a lot.

Why HYROX is a sodium event, not just a water one.

The protocol, front-loaded.

Keep reading

Your sweat rate

Why you cramp

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