Cold Plunge in Boston — L Street Studio

Our cold plunge lives at the L Street (East Campus) studio — 47 L Street, South Boston. It's a few blocks from the L Street Bathhouse, the original home of Boston's cold-water tradition. The A Street studio does not have a plunge.

We hold the plunge between 45–55°F. That's cold enough to trigger the full cold-shock and norepinephrine response, and controlled enough that first-timers can stay in safely for two to three minutes.

Beginners: 1–2 minutes. Most regulars: 2–4 minutes. Research on inflammation and mood benefits centers on roughly 11 minutes of total cold exposure per week, which you can spread across 3–4 sessions.

Reduced muscle soreness and inflammation, a sharp and long-lasting dopamine and norepinephrine lift, improved mood and stress tolerance, better sleep, and a trained vagal response that helps you stay calm under pressure.

After, and ideally not immediately after heavy strength training if hypertrophy is your goal — cold can blunt some muscle-building signaling. For endurance work, competition recovery, or back-to-back training days, plunge right away.

Fire & Ice alternates our infrared sauna with the cold plunge — typically 15 minutes hot, 2–3 minutes cold, repeated two to three rounds, always finishing cold. Contrast therapy drives circulation harder than either modality alone.

Yes, and it's our most popular L Street combo. Plunge first, then settle into a hydration or recovery IV while your body reheats — you get the cold-shock benefits plus the fluid and micronutrient replacement in one visit.

We screen for uncontrolled high blood pressure, cardiac conditions, arrhythmias, Raynaud's, pregnancy, and seizure history. Our RN staff supervises every plunge and stays with first-timers the entire time.

Swimwear, a change of clothes, and flip-flops. Towels are provided. Skip the plunge on a completely empty stomach, and don't plunge right after alcohol.

Single plunge sessions are our most affordable recovery service, with discounted Fire & Ice bundles and IV add-ons. Members save on every session — book directly at L Street below.