They fight their guts out for peanuts.
3 seconds sound clip from the Rocky (1976) movie soundboard.
You can hear this line at 01:03:39.533 in the Blu-ray version of the movie.
Quote context
[...]
- What?
- You gonna show up at the fight?
- Hello, kid. I seen your light. Can I come in?
- Hey, it's a nice place here.
- All right, anyway, what I come to tell you is that what happened to you is freak luck.
- Look at the other guys. Now, they're good fighters, right? They're colorful, they got good records.
- They fight their guts out for peanuts.
- But you... you get a shot at the title.
- Freak luck is a strange thing.
- Yeah? They make good soup, don't they?
[...]