Sauna for HYROX: What the Research Says, and Is a Backyard Sauna Worth It?

A sauna for HYROX isn’t just a place to relax. Two studies of runners suggest that sitting in the heat after training can make you fitter. If you train through a Las Vegas summer, better heat tolerance is a bonus.

Here’s what the research found, how to use it, and what a backyard sauna costs. We haven’t tested these saunas. Prices are from the maker’s product pages, checked on October 29, 2026.

What the research says about sauna for endurance

Study 1: competitive runners, 2007. Six male distance runners sat in a humid sauna at about 90°C for about 31 minutes straight after training, around 13 times over 3 weeks. Compared with normal training, their run time to exhaustion rose 32%, which the researchers estimated as about a 1.9% faster time trial. Plasma volume rose 7.1%, and they credited the gain mainly to more blood volume (Journal of Science and Medicine in Sport).

Study 2: trained runners, 2020. Twenty middle-distance and cross-country runners, 13 of them women, used a dry sauna at 101 to 108°C for about 28 minutes, within 5 minutes of training, about 3 times a week. After 3 weeks, compared with runners who didn’t use the sauna, they had (European Journal of Applied Physiology):

Measure	Sauna group vs. no sauna
VO2 max	Up about 8%, vs. about 2%
Time to exhaustion	Up about 12%, vs. about −1%
Peak heart rate in a hot run	11 bpm lower
Peak core temperature in a hot run	0.2°C lower

The authors called it “an effective and pragmatic method of heat acclimation.” Going on to 7 weeks added little.

The caveats. Both studies were small. The 2020 groups were self-selected, not randomised, and half the participants dropped out, mostly through training injuries. Neither study tested HYROX. Treat sauna as a promising extra, not a shortcut.

A sauna protocol for HYROX training

Based on those two studies:

• Go straight after training, not before.
• Build up to 25 to 30 minutes, starting shorter.
• 2 to 3 sessions a week for 3 weeks is what both studies used.
• Time it before a hot race, or the Vegas summer. Our desert heat guide covers training outside.

Safety first. Get out if you feel dizzy, sick or faint. Rehydrate afterwards, ideally with electrolytes. Skip alcohol. If you have a heart condition, low blood pressure, are pregnant or take medication, check with your doctor before using a sauna.

The Momentous Daily Hydration electrolytes on our gear page apply code HYROXVEGAS automatically. Our supplements guide covers the rest.

Check price on Amazon: LMNT electrolytes · Sauna hat · Sauna timer

Backyard sauna: Sweaty Yeti

Sweaty Yeti Sauna, based in Spanish Fork, Utah, builds backyard sauna cabins. The Sauna Fit stands out for HYROX: a 4 to 6 person cedar sauna and a dedicated workout room in one cabin, so you can train and go straight into the heat, like the studies did.

Model	What it is	Size	From
Sweaty Yeti Sauna	4 to 6 person sauna	8 × 9 ft	$29,700
Sauna Plus	6 to 8 person sauna and changing room	8 × 17 ft	$46,400
Sauna Max	8 to 12 person sauna	8 × 17 ft	$46,900
Sauna Fit	Sauna and workout room	8 × 17 ft	$47,200
Sauna Plunge	Sauna and cold plunge room	8 × 17 ft	$51,700
Fit Studio	Workout studio, no sauna	8 × 17 ft	$32,300

Our code: use hyroxvegas5 when you order.

What to know before you buy:

• Delivery within 250 miles is included. Las Vegas is roughly 400 road miles from Spanish Fork, so ask about delivery to Southern Nevada.
• On-site install equipment rentals aren’t included.
• Specs aren’t on the product pages. Heater power, electrical requirements and warranty aren’t listed, so get them in writing with your quote.
• It’s a big purchase. At these prices, a sauna is a long-term home upgrade, not a training gadget. Financing is offered through their site.

Shop now: Sweaty Yeti Sauna Fit · Sweaty Yeti Sauna · Sauna Plunge

Cheaper ways to get the heat

• A gym or spa sauna. Most of the protocol works anywhere, as long as you can get in right after training.
• Smaller home saunas. Barrel saunas and indoor infrared units sell for far less. Check heat and size: the studies used traditional saunas at 90 to 108°C, and infrared units usually run cooler.

Check price on Amazon: Outdoor barrel saunas · Indoor saunas

What it means for you

• Sauna is an extra, not the plan. Runs, stations and sleep come first. Our 12-week blueprint sets the base.
• Time it right. Three weeks of post-workout sauna before a big race is what the research tested.
• Recovery is a system. Compare sauna with foam rollers, massage guns and compression boots in our recovery tools guide, or build out your HYROX home gym.