But it's time to exorcise these demons
These motherfuckers are doing jumping jacks now

from Eminem – Not Afraid Lyrics on Rap Genius

A play on the pronunciation of “excorcise,” Em is saying he’s going to control the demons. Like a drill sergeant, he’s going to “exercise” them with jumping jacks. Will they win the Presidential Fitness Award?

Em is deciding to rid himself of the demons he alludes to in the previous line by cleaning himself up, as he explains in the next verse.

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