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THE SANCTUARY

Four spaces, one flowing ritual

Each of our facilities is a pleasure on its own. Together, they form a complete cycle of warming, cooling, restoring and glowing that our hosts will gently guide you through on your first visit.

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80–90°C · Live

The Finnish Sauna

Our traditional Finnish sauna is the soul of Agni-Jal. Lined in carefully selected Nordic timber and heated by a stone-filled stove, it reaches a dry, enveloping 80–90°C. Ladle water over the hot stones and feel the löyly, the soft wave of steam that Finns consider the spirit of the sauna. Sit on the upper bench for deeper heat or the lower bench for something gentler. Stay for 10 to 15 minutes, breathe slowly, and let the outside world fall away.

Deep relaxation and relief from muscle tension

The most traditional, sensory sauna experience

Perfect with a cold plunge to follow

45–60°C · GENTLE HEAT

The Infrared Sauna

Where the Finnish sauna heats the air around you, infrared warms the body directly, at a far more comfortable 45–60°C. The warmth feels deep and soothing rather than intense, so sessions can be longer and more meditative. It is a favourite for women who are new to heat therapy, and a beautiful partner to our red light pod.

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Fast warm-up, gentle on first visits

Soothing for tired muscles and stiff joints

Ideal before red light therapy

Woman relaxing on the bench of a timber infrared sauna at Agni-Jal, Hampstead
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3–12°C · THE RESET

The Cold Plunge

Our cold plunge pool is kept at a crisp, carefully controlled temperature, and filtered and treated to the highest hygiene standards. A plunge of 30 seconds to two minutes after the sauna is invigorating, clarifying and, our members tell us, quietly addictive. First time? Our hosts will show you how to breathe, how long to stay and how to ease in. You set the pace.

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Alert, clear-headed and energised

Eases muscle soreness

The contrast is what elevates the heat

RED & NEAR-INFRARED · THE GLOW

The Red Light Pod

Step into a calm, warm glow. Our full-body red light pod uses red and near-infrared wavelengths, the same type of light studied in dermatology for skin rejuvenation. Sessions last around 10 to 20 minutes and require nothing of you but stillness.

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Non-invasive, with no heat stress

Supports skin quality and a healthy complexion

A restful ending to every visit

Woman standing in the warm glow of a full-body red light panel at Agni-Jal, Hampstead

The Relaxation Lounge

Between rounds, rest in our lounge with herbal infusions, chilled water and fresh fruit. Soft robes, warm towels, premium toiletries and hairdryers are provided, so you need only bring yourself.

The Agni-Jal Ritual

A typical visit follows a simple, time-honoured rhythm.

1

Warm

10 to 15 minutes in the Finnish or infrared sauna.

2

Cool

A brief, bracing immersion in the cold plunge.

3

Rest

10 minutes in the lounge, letting the body settle.

4

Repeat

Two or three rounds.

5

Glow

Finish in the red light pod.

Ready to experience it?

Agni-Jal offers wellness experiences, not medical treatment. Please consult your GP if you are pregnant or have a medical condition.

© 2026 Agni-Jal

Hampstead, London. Full address shared on booking.

Agni-Jal offers wellness experiences, not medical treatment. Please consult your GP if you are pregnant or have a medical condition.

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