His legs felt like lead.

Meaning: His legs were very tired and heavy, making it difficult for him to continue running.

Choice of Words: The word "legs" refers to the two long limbs that allow a person to walk or run. "Felt" means to experience a physical sensation. "Lead" is a heavy, soft, silvery-white metal. When combined, these words convey the sensation of a person's legs feeling heavy and tired, as if they were made of lead.

Alternative Expressions

Related Expressions