For years now freezing cold showers have been one of my favourite protocols for immediately increasing my mood, focus, and energy. 
I am always amazed by the profound shift that takes place over my mind and my body in such a short space of time.

Yes the discomfort is intense. Push through though and you will be greatly rewarded with immediate and lasting effects on your physiology and psychology.

A good way to ease into cold therapy is to take your usual warm shower and then finish with cold on the lowest setting. Just thirty seconds is enough to notice an effect. From here you can build up to longer times if you desire, or go straight cold with no prior warm.

Did my cold dip this morning then listened to a podcast with the King of cold therapy - Wim Hof

Check out the show at https://player.fm/series/london-real-59740/wim-hof-the-iceman

Fascinating listening.

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"In the Bhagavad Gita they say, 'The mind under control is your best friend, the mind wandering about is your worst enemy.' Make it your best friend, to the point where you can rely on it. Your mind makes you strong from within. It is your wise companion. The sacrifices you make will be rewarded. Life doesn't change, but your perception does. It's all about what you focus on. Withdraw from the world's influence and no longer be controlled by your emotions. If you can grab the wheel of your mind, you can steer the direction of where your life will go."

-Wim Hof