Have you ever tried 21 day scottish shower challenge?

Anonymous
The goal is to break your routine and get you out of your comfort zone, making you feel better and more active.

For 21 days, you take normal shower and on the end of shower you turn the water all the way to cold part and hold it that way for some time. You start by holding it shorter and then you make it longer each day.
Have you ever tried 21 day scottish shower challenge?
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