Have you heard of "Uncle Rhabdo?"  It's a common thing in crossfit called rhabdomyolysis.  That is basically chunks of your muscle tissue breaking off and entering your system, thus poisoning yourself.  It's extremely fucking stupid and anyone in their right mind would avoid crossfit.  I laugh at anyone who asks about it, I like Olympic lifts and I do them myself.  However, I don't pull off this fucking bullshit.