So… Give Up?
While it is true that at one point double negatives were accepted characteristics in the English language (look no further than William Shakespeare), the fact is convention eradicated double negatives in standard English hundreds of years ago.
“Never don’t give up” is equivalent to “always give up,” if you think about it. Not trying to be mean here, but giving up is just what this guy does whenever it comes time to hit the gym and put in a workout, judging by his underdeveloped biceps.