his/her legs
Grab his legs.
Si elle laisse tomber son crayon, ramasse-le, mais regarde pas ses jambes.
If she drops her pencil, pick it up, but don't look at her legs.
— Les Quatre Cents Coups (1959)
Elle l'a étranglé avec ses jambes.
She strangled him with her legs.
Marie étendit ses jambes.
Mary stretched out her legs.
Les garçons, on prend ses jambes à son cou, en rangs.
Boys, run for it—in formation.
— Moonrise Kingdom (2012)
His legs are long.