ELI5 Ice Baths & Warm Showers - what are the benefits?

How effective are ice baths and what are the benefits? How did they become so popular? Is it wrong to take a hot shower after a big meal? Is there danger from taking a shower in a thunderstorm?

... we explain like I'm five

Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: jimmyb3121, qjkxkcd, copnonymous, sixpennydruid, nova_saibrock, xylarthetimeless and greenstrong

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