If thereâ€™s such a thing as the boogeyman of the fitness industry, itâ€™s rhabdo. You could even take that statement literally, since many functional fitness gyms (and occasionally the CrossFit Journal) are adorned with images of Rhabdo the Clown, a musclebound harlequin who makes â€œItâ€? look like a childrenâ€™s entertainer. Like a lot of boogeymen, itâ€™s shrouded in fear and mystery, which only increases its power. So what is rhabdo, and how do you avoid it?