Working my muscles to the bone

Meaning

Exercising intensely to the point of exhaustion.

Examples

• John: I had a brutal workout today.
• Alice: Sounds intense! Were you <b>working your muscles to the bone</b>?
• John: I was completely exhausted afterward. I really pushed myself.
• Alice: You'll feel it tomorrow, for sure! It's good to have days where you're <b>working your muscles to the bone</b>.