A forty five-minute soak in a sizzling bathtub raises your core physique temperature by greater than a full diploma — 1.1 levels C (2 levels F) to be precise — and ramps up your cardiac output by 3.7 liters per minute. That is the type of response you’d count on from a stable session of average cardio train. But all it’s important to do is sit in a bathtub.
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