She is a twin sister.

The inferior gemellus muscle is a part of the human body, mainly supporting the movement from the waist to the leg.

He injured his knee joint.

He injured his knee.

He started a special exercise to strengthen his articularis genus muscle.

He is doing special exercises to strengthen his popliteus muscle.

He mainly eats vegetables.

I strained a muscle at the gym yesterday.

He was dancing, swinging his hips.

This world where people live is beautiful, and sometimes harsh.