What is CrossFit and why am I doing it?

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"CrossFit is a hype!" - "All movements are done wrong!" - "CrossFitters" can't even lift heavy!" These are the typical complains and quotes I hear from others when talking about CrossFit. But what is CrossFit and why am I doing it? ... I'll tell you! What is CrossFit? Since roughly 9 months I'm infected by the sports ...