What happens during a cryotherapy session — minute by minute.

Most studios ask first-time clients to arrive 10 to 15 minutes early. The intake process involves a brief health questionnaire covering contraindications — uncontrolled hypertension, Raynaud's disease, cold urticaria, pregnancy, recent heart events, and open wounds. A staff member reviews the form, explains the format (nitrogen or electric, session length, what to wear), and answers questions. This is the right moment to ask about operator presence, ventilation, and chamber type. A good studio welcomes these questions; a dismissive response is a signal to leave.

Clients change into minimal clothing: underwear or shorts for all genders, plus a sports bra or tank top for women who prefer coverage. The studio provides protective gear — thick socks or booties, gloves or mittens, and sometimes a headband or ear protection. Extremities are the most vulnerable to frostbite, so the socks and gloves are not optional. All jewelry, piercings, and metal accessories must be removed — metal conducts cold rapidly and can cause skin burns at cryotherapy temperatures. Skin must be completely dry; any moisture on the skin will freeze on contact with the cold air.

For a nitrogen cryosauna, the client steps onto a platform inside a cylindrical chamber and the operator adjusts the platform height so the client's head sits above the rim. The door closes, vapor begins to fill the chamber from the bottom, and the temperature drops rapidly. The first sensation is not pain but surprise — the cold registers as a sharp, dry pressure on the skin rather than the wet, penetrating chill of an ice bath. For an electric walk-in chamber, the client enters a room pre-cooled to the target temperature; the cold hits all at once rather than building from below.

After the initial shock, the body's cold-stress response activates. Peripheral blood vessels constrict, pulling blood toward the core. Heart rate increases modestly. The skin feels tight and tingly, and the extremities — especially fingers inside the gloves and toes inside the socks — become the most uncomfortable areas. Most first-timers describe the sensation as intense but tolerable, somewhere between 'uncomfortable' and 'startling.' Breathing tends to quicken; the operator will often coach slow, steady breathing through this phase. The urge to move — shifting weight, rubbing hands together — is natural and most studios encourage it.

First-time sessions typically end at two minutes. Clients who have done several sessions may extend to three minutes, which is where the subjective intensity peaks. The skin surface temperature has dropped to roughly 0 °C to 5 °C by this point, and the nervous system is in full sympathetic activation — norepinephrine and endorphins are surging. The discomfort does not increase linearly; most clients report that minute two to three feels similar to minute one to two, not worse. The operator counts down the final 30 seconds, and the session ends with the vapor clearing and the door opening.

Stepping out of the chamber produces an immediate and distinctive sensation. As the ambient air — even at normal room temperature — hits the cooled skin, the body begins rapid vasodilation. Blood rushes back to the periphery, and the skin flushes pink. A wave of warmth moves from the core outward. Most clients describe this moment as the most pleasant part of the entire experience — a sudden, full-body sense of warmth and relief that feels disproportionate to the actual temperature change. This is the vasodilation rebound, and it is the physiological basis of the 'afterglow' effect.

The post-session period is characterized by elevated mood, mental clarity, and physical energy. The norepinephrine surge — which peaked during the session — remains elevated for 30 to 60 minutes and produces a calm, focused alertness that regular practitioners describe as the primary reason they return. Some clients experience mild euphoria; most describe it as simply feeling awake and good. The endorphin component adds a subtle analgesic quality — minor aches and stiffness often feel reduced. This effect is temporary but consistent, and it is the experience that converts first-timers into repeat clients more than any marketing claim.

Arrive hydrated but not on a full stomach. Remove all jewelry before leaving home, not at the studio. Wear underwear that covers comfortably — this is not the time for minimal coverage. Ask the operator to start with a two-minute session regardless of what the studio's default is. Breathe slowly and steadily through the nose if possible; mouth-breathing in extreme cold can feel uncomfortable in the throat. Do not expect the session to feel like an ice bath — the sensation is drier, sharper, and shorter. And do not judge the practice by the session itself; judge it by how the next two hours feel. The session is the input. The afterglow is the product.