How athletes can use sauna around training, what the plasma-volume and heat-adaptation research shows, and how to rehydrate when sweat stacks up.

Why many women feel less thirsty in perimenopause and beyond, the signs you're running low, and simple habits for drinking on purpose.

What the research measured, why infrared sweat builds more slowly than in a traditional sauna, and how to rehydrate after a session.

What near, mid and far infrared actually are, what the research does and doesn't show, and a no-hype checklist for choosing an infrared sauna.

Learn how to choose the best electrolytes for sauna recovery: the five label checks, what to avoid, and how to match the dose to your sweat.

Learn how to tell if you're a heavy or salty sweater, what research says about sweat sodium, and when a 700mg electrolyte serve makes sense.