There are definitive and proven health benefits from taking cold showers and going to cryotherapy. Both work by the same concept that cooling the body down allows us to function better.

Let me tell you it takes BALLS to do it months on end like I have. It takes a discipline to do it every day.
Some days you plain just don't want to do it.

Here is a good intro to the subject by a Navy Seal:

If the cells in the body are inflamed by physical stress, mental stress or just the outside temperature being hot the cells in your body are more likely to develop cancer.

List of health benefits:

It reduces stress

It increases how you respond and adapt to stressful situations. It lowers uric acid which when built up develops in the body by giving the person gout and potential kidney failure. Also increases Glutathione in the body that is a natural antioxidant for the circulatory system.

Makes you more alert

If you have done a cold shower like I have you know that when you first start taking the showers it is hard to breath. You breath deeper but in the end it is better than a cup of coffee in the morning! ( Haha I still drink coffee though )

Promotes weight loss

Yeah you heard me a cold shower in the morning can promote weight loss. In fact I have heard that 10-15 minutes of shivering and deep breathing like this can be the equivalent of a one hour workout! It makes more sense when you look at from a heart rate perspective. Your heart is working that much harder to maintain some heat in the body.

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Cold showers have been proven to increase testosterone

It is up in the air on how much but in this one study I have seen shows it increased testosterone. This could be good for men that have low testosterone and don't want to use supplements.

Cold showers can relieve depression

When exposed to cold the area in the brain responsible for emitting noradrenaline is activated. Noradrenaline is a chemical that takes a role in combatting depression. This could be usueful for someone out there in the steem world.

Cryotherapy is used for nerve pain and localized cancers in the body

The freezing temperatures of cryotherapy deaden the nerve and can isolate cancers like prostate cancer that often spreads too quickly to other parts of the body.

Disclaimer: Don't do this if you have a heart condition or have consulted your physician first.

Thanks and Adios Amoebas, It is time for me to ride off into the sunset