You know I got it down, dog
Al Roker, I used to knock pounds off

from Jay Z (Ft. Kanye West) – Hate Lyrics on Rap Genius

Meaning

Al Roker lost a lot of weight by dieting and doing yoga (in which “downward dog”, on which Jay is making a pun, is the most basic position)

Jay Z used to “knock pounds off” by selling pounds of drugs (it can be very good exercise!)

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