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Honest, evidence-based wellness writing.

457 guides on saunas, cold plunge, retreats, and the practices behind them. What each is, what the research says, and how to choose.

What this library is

Every guide here is written to answer one question and then say where the evidence stops. 179 of the 457 link the studies or primary sources they lean on, 315 carry a plain-language FAQ, and 114 have been revised since first publication. We correct pieces rather than quietly leave them. We do not accept sponsored posts, we do not run affiliate links in the guides, and where a practice has weak evidence we say so instead of hedging.

The library splits six ways: getting started (122) , modalities (57) , comparisons & reviews (80) , planning & booking (64) , destination guides (51) and wellness science (83) . If you are looking for somewhere to actually go rather than something to read, the city maps cover 34 US cities.

Start here
Wellness Science Sauna benefits: what the science actually says Modalities Ice baths & cold plunges: what they do, and how to start without hurting yourself Wellness Science Contrast therapy (hot and cold): what it is and the benefits Planning & Booking How to choose a wellness retreat: a step-by-step guide Planning & Booking Are wellness retreats worth it? An honest answer Getting Started Your first sauna session: what to expect, etiquette, and how long to stay
A white light therapy lamp glowing on a wooden desk beside a window on a dark winter morning, with a mug and a notebook
Wellness Science · Oct 7, 2026

Does a SAD lamp work? What the trials show, how long to use one and who should check first

For winter depression, yes. Bright white light, about 10,000 lux for 30 minutes first thing in the morning, beat placebo in randomized trials, and it should help within 3 to 4 weeks if it is going to. Some medicines, eye conditions and bipolar disorder call for a doctor first.

A wooden sauna bench with a rolled white towel, a glass of water and a wooden bucket and ladle in warm light
Getting Started · Oct 6, 2026

Can you sweat it out? Alcohol, THC, nicotine, caffeine, a cold, a fever and toxins

Mostly no. About 1% of the alcohol you drink leaves through the skin, sweat carries only traces of THC and nicotine, and the liver, kidneys and gut do the clearing. A sauna will not end a hangover, a cold or a fever.

A plain gift card tied with twine beside a folded white towel and a sprig of eucalyptus on a pale wooden table
Planning & Booking · Oct 6, 2026

Do spa gift cards expire? The federal five-year rule, fees, and the promo-card catch

Under federal rules, the money on a spa or massage gift card cannot expire sooner than five years after it was bought or last loaded, and an inactivity fee needs a full year of non-use. Promotional bonus cards and paper-only certificates are excluded.

A steaming natural hot spring pool among boulders, with pine trees and snow-capped mountains behind
Getting Started · Oct 6, 2026

Hot springs and the brain-eating amoeba: how rare it is, and the one rule that matters

The risk is real but very rare: the CDC counts 167 US cases from 1962 to 2024, typically fewer than 10 a year. The amoeba infects only when water goes up the nose, so the CDC's rule for hot springs is to keep your head above water.

A calm natural hot spring pool edged with smooth stones, light steam over the water and a towel folded on a flat rock
Getting Started · Oct 6, 2026

Hot springs while pregnant: what ACOG, the CDC and the studies say

Early in pregnancy, skip the soak: ACOG says it's best not to use a sauna or hot tub, and a hot spring heats you the same way. Natural springs add water with no thermostat and untreated water, so ask your provider first.

A quiet spa room with an empty wooden sauna door ajar, two folded towels and two glasses of water on a bench
Getting Started · Oct 6, 2026

Sauna or hot tub while trying to conceive: what the evidence says for both partners

Heat matters most once you might be pregnant: neural tube defects happen in the first few weeks, often before a positive test. For the partner producing sperm, regular sauna use cut sperm count in a study, and it reversed after stopping.

A quiet hotel spa corridor with a glass-fronted wooden sauna and a small stone cold plunge pool, soft evening light
Planning & Booking · Oct 6, 2026

New York hotels with a sauna or cold plunge, from the hotels' own pages

Aman New York lists a sauna, steam room and cold plunge terraces; ModernHaus SoHo hosts an infrared sauna and cold plunge pop-up; Virgin Hotels sells a $50 weekday sauna and hammam day pass; the William Vale has barrel saunas and hot tubs.

A row of padded loungers in a bright, empty gym recovery area with a folded towel on one seat
Planning & Booking · Oct 5, 2026

Does Planet Fitness have a sauna? What the Black Card Spa actually includes

Planet Fitness lists no sauna, steam room or pool at its 2,900+ locations. The PF Black Card Spa has massage chairs and, at participating clubs, HydroMassage, tanning, Total Body Enhancement, a Wellness Pod and a Recovery Lounge. None of them is a sauna.

A wooden gate in a Japanese-style garden opening onto a stone path between citrus trees, with dry hills behind in warm evening light
Comparisons & Reviews · Oct 5, 2026

Golden Door vs Canyon Ranch: a set Sunday week or a stay you build yourself

Golden Door runs seven-night weeks that all start on a Sunday, 37 of the next 52 of them women's weeks, with a daily in-room massage and no published rates. Canyon Ranch sells flexible all-inclusive stays at Tucson, Lenox and Austin, with offers from $1,000 a guest a night.

A modern gym locker-room sauna with cedar benches seen through a glass door, with a white towel folded on the bench
Planning & Booking · Oct 5, 2026

Which gyms have a sauna? Life Time, Crunch, Equinox, EōS, the YMCA and Planet Fitness checked

We read the gym chains' own pages: Life Time lists a sauna at 183 of 209 clubs and a cold plunge at 82, 346 of 630 Crunch locations list a sauna, Equinox and EōS include them, Ys vary by branch, and Planet Fitness has none.

A shaded kitchen table by an open window on a bright summer day, with a large glass of iced water and an electric fan
Wellness Science · Oct 5, 2026

Medications that raise your risk in a heat wave: what the CDC and the drug labels say

The CDC's 2025 guidance names diuretics, anticholinergic drugs and some psychiatric medications as commonly prescribed drugs that raise heat risk. How each one does it, what the FDA labels say, and why the answer is a plan for hot days rather than stopping a medicine.

A private infrared sauna suite with a wooden bench, warm red light panels and a rolled towel, seen through an open glass door
Planning & Booking · Oct 5, 2026

Perspire Sauna Studio prices: what a session and a membership cost at 103 locations

We read the price list on all 103 Perspire Sauna Studio locations that publish one. A single 40-minute session costs $39 to $80, median $60, the intro session $20 to $40, and an unlimited month a median $199.

All 457 guides, A to Z