The human question
A heated room changes hydration and heat-strain risk; sweat is cooling, not proof that toxins are leaving. The useful question is not whether a health idea sounds impressive, but whether it helps a real person make a safer decision. Culture, disability, cost, care access, medication and the demands of an ordinary week all change what is practical.
What the evidence says
Evidence does not show that hotter automatically means healthier, and pregnancy, medicines and some conditions alter heat tolerance. That distinction matters because a population average is not a personal forecast. Study design, follow-up, absolute benefit, harms and who was excluded deserve as much attention as a headline result.
A gentle experiment
A gentle experiment: Drink normally beforehand and learn the studio's heat and exit policy. Decide what you will observe before you start, keep the experiment small, and do not confuse discomfort with virtue. A repeatable step usually teaches more than an ambitious plan abandoned after one difficult day.
Where the advice changes
Where the advice changes: Leave for headache, confusion, nausea, weakness or faintness; pregnancy requires medical advice. Symptoms, medicines, pregnancy, disability, eating-disorder history and chronic conditions can all change the safest route. Online education cannot examine or diagnose an individual.
What real life requires
Real life rarely follows a clean before-and-after arc. Improvement may mean fewer hard days, more confidence, a better question for a clinician or the ability to return after a setback. Adaptation is part of good care, not evidence that you failed the plan.