Smooth muscles contract spontaneously and control many internal movements of the body.

He stretches his flexors every day.

He is training his brachialis muscle every day.

He is training his oblique muscles at the gym every day.

He is doing special exercises to strengthen his tongue muscle.

He is doing special exercises to strengthen his dilator muscle.

He is doing special exercises to strengthen his pectineus muscle.

She exercises every day to strengthen her gracilis muscle.

It's important to train your antagonist muscles as well when doing muscle training.

As I was walking down Tenkajiku, there were many shops lined up.