General
boulders
What does boulders mean?
Slang for large, rounded, well-built shoulder muscles (deltoids).
"His delts are boulders — capped and round from every angle."
Origin
Shortened form of 'boulder shoulders' gym slang.
Frequently asked questions
What does 'boulders' mean in the gym?
It's slang for large, rounded, well-developed shoulder muscles (deltoids), short for 'boulder shoulders.'
How do you build boulder shoulders?
Lifters typically train all three heads of the deltoid with presses and raises to get that capped, round look — though 'boulders' just describes the result.
What are 'capped' delts?
Capped delts are shoulders whose muscle is so developed it looks like a rounded cap sitting on top of the arm, a look often called boulders.
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