Usage Note
Musculaire is an invariable-ending adjective (same form for masculine and feminine: un effort musculaire, une douleur musculaire). It is used in both medical (dystrophie musculaire — muscular dystrophy) and fitness contexts. The colloquial adjective for a physically muscular person is musclé, not musculaire.
Examples
"Il souffre d'une contracture musculaire."
Natural Translation
He is suffering from a muscle cramp.

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