I personal train amazing then I exercise greatness
You ain't shit my set reppin when its war on
I have two niggas pushup and show you four arms

from Los – 6'7 (freestyle) Lyrics on Rap Genius

Meaning

Los works to be the best and shows it//
You’re nothing to him and his crew is down when it’s time to hit a lick.. This also is dope word play on “train” and “exercise”//
He has two goons that run up on you and throw the hands (forearms) “pushup” is also word play on all that exercise jazz.

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