The sauna
A traditional Finnish sauna with a smart heater and tiered benches. Dry, hot, and quiet. Perfect for your relaxation and recovery.
Opening soon in Alton
Get hot.
Get cold.
Get recovered.
Alton's first dedicated sauna and cold plunge recovery suite. An authentic Finnish sauna, two cold plunges and a hot tub, tucked at the back of Esprit De Corps, an established Alton name in fitness and health. Simply book through your phone and head straight into our pre-heated sauna, before getting on with your day.
No payment today — founding places are free to reserve
90°C
Finnish sauna
4°C
Two cold plunges
38°C
Hot tub
60min
Standard session
The suite
Everything you need to recover and relax.
One room, four pieces of kit, built for contrast therapy — the hot-cold-hot cycle that athletes have used for decades and that the rest of us are just starting to realise.
Two cold plunges
Chilled and filtered, held at plunge temperature all day. Two tubs means no waiting for your turn when the sauna empties out.
The hot tub
A commercial-grade hot tub for the slower end of the session. A place to chat and socialise when you've had enough of the sauna and plunges.
Showers & changing
Rinse-off shower and a private changing area. Somewhere dry to leave your kit. Bring your own towels.
How it works
Book it and turn up. That's it.
No reception, no waiting around. The suite runs itself so you can drop in around training, work or the school run.
Book your slot
Pick a time on your phone. Sessions run every hour, seven days a week, from dawn till dusk.
We heat it up
Your booking tells the sauna you’re coming. It's at temperature by the minute you arrive. No waiting, no wasted energy.
Tap to get in
You will be issued a code for the gate that works for your entire booking. No hassle and private. Just for you and an exclusive few.
Leave it as you found it
Rinse off, change, and head out. The water treatment and turnaround happen on their own between sessions.
The booking system
Built, tested, and waiting for opening day.
Pick your session, pick a time, answer a short health check, pay. Sixty seconds on your phone and the sauna starts heating for you.
- Real availability. Sessions are capped, so a slot that shows as free is exactly that.
- Private hire takes the whole suite. Book it and nobody else can book over you.
- Book up to three months ahead. Plan recovery around training blocks, holidays and events, not just the week in front of you.
- Card payment handled securely. We never see or store your card details.
Why contrast
Hot, cold, repeat.
Fifteen minutes in the sauna, two in the plunge, and back again. It's a simple loop, performed in Scandinavia for centuries, we’re only now realising its benefits.
- Recovery after training. The reason most of our members will walk through the door. Get those legs working again after a hard session of training.
- Sleep and stress. A late sauna is the most reliable off-switch most people will ever find.
- A hard thing done early. Two minutes in cold water sets a tone for the day that coffee can't beat.
- Twenty minutes of solace. No phone, no screen, nowhere to be. Underrated.
PHOTO — the sauna interior, benches and heater, warm low light
The evidence
What the research shows.
Saunas aren't a wellness fad in Finland, they're plumbing. There are around 3.3 million of them for 5.5 million people, more saunas than cars, and roughly nine in ten Finns use one every week. UNESCO put Finnish sauna culture on its heritage list in 2020. That national habit is why the best long-term data on heat exposure comes from Finland, where researchers could follow ordinary people doing this for decades.
63%Reduction in risk of sudden cardiac death
Lower risk among men using a sauna 4–7 times a week, compared with once a week.
JAMA Internal Medicine, 2015
40%lower all-cause mortality
Lower risk of dying from any cause over the same 20-year follow-up.
JAMA Internal Medicine, 2015
66%lower risk of dementia
Lower risk of a dementia diagnosis; 65% lower for Alzheimer's specifically.
Age and Ageing, 2017
46%lower risk of high blood pressure
Lower risk of developing hypertension among men with normal blood pressure at the start.
American Journal of Hypertension, 2017
Where those numbers come from
Nearly all of them trace back to one remarkable piece of work: the Kuopio Ischaemic Heart Disease Risk Factor Study, which followed 2,315 middle-aged Finnish men for an average of more than twenty years and recorded how often they used a sauna.
The striking part is the dose response. Men going 2–3 times a week saw a meaningful reduction in risk; men going 4–7 times a week saw roughly double it. That pattern is more exposure, more benefit.
The proposed mechanism is unglamorous and plausible. A hot sauna pushes your heart rate to 120–150 beats per minute, similar to moderate exercise, while blood vessels dilate and blood pressure falls afterwards. Do that several times a week for twenty years and it starts to look like training.
Cold water: what it does, and what it doesn't
Cold immersion has a smaller and more mixed evidence base than heat. What it reliably does is reduce muscle soreness after hard sessions, and produce a sharp rise in noradrenaline, the mechanism behind the alertness and mood lift people describe.
What it doesn't do is help everything. A systematic review pooling the trials found that cold immersion straight after resistance training measurably blunts strength and muscle growth over time. Endurance adaptations aren't affected.
So the practical advice: if you've just lifted heavy and you're chasing size or strength, leave a few hours before you plunge, or just sit in the sauna. After conditioning, a race, or a hard week, plunge away.
Being straight with you.
Most of the striking numbers above come from observational studies. They show
that frequent sauna users had better outcomes, not that the sauna caused it.
People who use a sauna four times a week may simply be healthier, or better off,
or well enough to go. Researchers adjusted for the obvious factors, but that
only goes so far. The controlled trials that could settle it are small and their results are mixed. A 2025 trial of regular post-exercise sauna, for instance,
found no improvement in heart rate variability at all. Anyone selling you
certainty here is overselling.
What we'd say instead: the evidence is genuinely promising, the tradition is
centuries old, and it feels excellent. That's enough.
Sources Laukkanen T, Khan H, Zaccardi F, Laukkanen JA. "Association Between Sauna Bathing and Fatal Cardiovascular and All-Cause Mortality Events." JAMA Internal Medicine, 2015 · Laukkanen T, Kunutsor S, Kauhanen J, Laukkanen JA. "Sauna bathing is inversely associated with dementia and Alzheimer's disease in middle-aged Finnish men." Age and Ageing, 2017 · Zaccardi F, Laukkanen T, et al. "Sauna Bathing and Incident Hypertension: A Prospective Cohort Study." American Journal of Hypertension, 2017 · "Throwing cold water on muscle growth: a systematic review with meta-analysis of the effects of post-exercise cold water immersion on resistance training-induced hypertrophy," 2024 · UNESCO Representative List of the Intangible Cultural Heritage of Humanity, "Sauna culture in Finland," 2020.
Membership & sessions
Two ways in.
Come for up to 7 sessions in a week on a membership, or pay for the odd session when you need it. Founding members lock in the opening rate for good.
Drop-in
One session, no commitment.
£15/ session
60 minutes, sauna and plunges
- Full use of sauna, plunges and hot tub
- Book up to 3 months ahead
- Bring a guest at the same rate
Founding rate — first 40 only
Full
The one most people will want.
£45/ month
£60 / month for as long as you like
- 7 sessions a week, any time we're open
- Book up to 3 months ahead
- Guests at £10 instead of £15
- Rolling monthly — cancel whenever you like
Private hire
The whole suite, just your group.
£75/ 60 min
Up to 6 people
- Exclusive use of the whole suite
- Birthdays, teams, a Sunday with friends
- Extra 30 minutes for £25
EDC members get their own rate — see membership options.
Before we open
Founding members get the rate for life.
— of 40 founding places left
We're fitting out now. The first 40 people on this list get the £45 founding rate locked in permanently, and an invite to the soft launch before we open the doors properly.
Nothing to pay now. We'll email you once with the opening date and how to join and that's it for now!
Rather get set up properly? Create your account now — it takes a minute, there's nothing to pay, and you'll be ready to book the day we open.
Founding places have gone
Too late for founding membership.
All 40 founding places are taken. You can still reserve a full membership on exactly the same terms — £60 a month, card stored now, nothing charged until the day we open, cancel any time before that.
PHOTO or MAP — the building from the outside, or a map pin on Alton
Where to find us
Behind Esprit De Corps Crossfit, in Alton.
We're building the suite at the back of Esprit De Corps Crossfit, so if you already train there, recovery is now about thirty steps from the rig. If you don't, you're welcome all the same; you don't need an Esprit De Corps membership to use it.
3/4 Coomers Buildings, Mill Lane
Alton, Hampshire GU34 2QG
backoftheboxwellness@gmail.com
Parking is on site and free. Come changed or change here, the choice is yours.
Questions
The things people ask.
We're in the build phase now. Join the founding list and you'll be the first to know the date, we'll email you as soon as it's fixed.
No. The suite is open to anyone. Members of Esprit De Corps Crossfit get their own rate, but you can book a drop-in or take a recovery membership without ever setting foot in Esprit De Corps Crossfit.
Swimwear, a towel and flip-flops. That's it. Come changed if you can, only because it makes your hour go further.
The first thirty seconds are genuinely unpleasant. Start with a shorter dip — twenty or thirty seconds is a real session at first — build from there. Nobody's judging!
Yes, and that's the part we've spent the most time on. Water quality is managed by automated dosing and filtration with a scheduled testing and record-keeping regime; there's an emergency call point in the suite, clear signage, and remote monitoring on temperatures. You'll also complete a short health check when you first book. During opening hours of Esprit De Corps next door, there will always be a friendly coach on site for any extra questions!
Heat and cold both put load on your heart. If you're pregnant, have a heart condition, high or low blood pressure, epilepsy, or you're recovering from surgery or illness, please speak to your GP before booking. Never use the suite after drinking. We'll ask you to confirm all of this when you book.
Yes — private hire is £75 for 60 minutes for up to six people. Good for a birthday, a team, or a Sunday morning with people you actually like. Additional time can be booked on top at a discount rate.
Sessions are capped at six people so the sauna never feels crowded and you're not queuing for a plunge. Book privately if you'd rather have it entirely to yourself.
Alton's had everything except this.
Forty founding places at £45 a month, locked in for as long as you stay. Takes twenty seconds and costs nothing today.