This is the 10709th most frequent French word.
musculer
To strengthen or develop muscles.
Here, 'muscler' is used in a reflexive form 'se muscler', indicating the act of building muscle or getting physically stronger oneself.
Il travaille dur pour se muscler avant l'été.
He works hard to build muscle before summer.
Here, 'muscler' is used in a direct object context, implying the action of strengthening or increasing the musculature of a particular body part.
Les médecins ont recommandé des exercices pour muscler son dos.
Doctors recommended exercises to strengthen his back.
Here, 'muscler' is used figuratively to mean making something stronger or more effective, referring to the context of business improvement.