the.com/hydrotherapy

Paying good money to be hit with water you'd normally complain about for free.

means The use of water — in baths, jets, steam, or ice — as a treatment for pain, injury, or illness.

from Built from Greek 'hydro' (water) and 'therapeia' (healing, service, treatment) — the same 'therapeia' that gives us therapy. The practice itself is ancient (mineral baths, hot springs, cold plunges all predate the word), but 'hydrotherapy' as a formal term took shape in the 1800s, when the water-cure movement turned soaking and spraying people into a proper medical fashion, complete with clinics and earnest men in white coats.

origin
ancient greeks and romans basically invented the spa day
mechanism
temperature contrast forces blood vessels to exercise
modern use
athletes ice-bath to reduce muscle inflammation fast
range
spans jacuzzis to literal underwater treadmills
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