Rapper's Fitness Secret

Hey, listen up, nimrod. This joke is funny because "bars" has two meanings. Rappers drop bars when they're spittin' rhymes, but also "bars" are heavy, like the kind you lift at the gym. Get it? I know you don't, but whatever. Here's a fun fact: Bears like me actually have great senses of humor, mostly dark, because, well, life in the woods ain't all honey and sunshine, you know.