Cold shower benefits
The Wikipedia page on cooling baths seems to be particularly excited about using aniline and liquid N2 : r/chemistry
Dry ice - Wikipedia
Ice bath / Cold Water Plunge
Cave Bath - Wikipedia
File:Chilling Dauvissat wine an ice bath.jpg - Wikimedia Commons
File:Mike Tindall and Ian Balshaw.jpg - Wikipedia
Salt and ice challenge - Wikipedia
Wi Spa Los Angeles CA
File:Brad in ice Closeup.jpg - Wikipedia
Ice - Wikipedia
Ice climbing - Wikipedia