Yuu is hanging out the laundry.

He chose a character named Sen.

Mother laid out delicious dishes on the dining table.

He is training his rectus abdominis muscle every day.

He is doing squats to strengthen his rectus femoris muscle.

He is doing special exercises to strengthen his superior rectus muscle.

He is doing special exercises to strengthen the lateral rectus muscle.

He is doing a special exercise to strengthen his inferior rectus muscle.

He is doing special exercises to strengthen his medial rectus muscle.

The rectus capitis anterior muscle is part of the neck muscles, helping to bend the head forward.