水風呂について調べてみると、一杯情報がありますね。
効能も多くあります。
ダイエット、疲労回復（免疫向上）、美肌、自律神経の調整、増毛などです。
増毛効果もあるようですが、頭を水につけるか、水をたっぷり被るかしないといけないみたいです。まだ水風呂に肩までしか入れないので増毛は諦めます。
If I research water baths, I find a lot of information about them.
There are also many benefits.
Diet, recovery from fatigue (immunity improvement), beautiful skin, autonomic nerve regulation, hair growth, etc.
It also seems to have the effect of increasing hair growth, but I guess you have to put your head in the cold water or cover it with a lot of cold water. I can only take a water bath up to my shoulders, so I’m giving up on hair growth.
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https://onsen.community2.fmworld.net/articles/2421/
水風呂に期待できる効果・効能