Has anyone ever done a 21 day cleanse?

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I'm embarking on this 21 day cleanse that I read about. I liked it because it's more of a mind and body cleanse. I'm not looking to release "toxins" as my body does that perfectly fine on its own. I'm looking to be more in tune with my body learning how to adjust to healthier living. I'm looking for anyone who was able to succesfully complete that.