Training the respiratory muscles is very important for aiding breathing.

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

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

If the movement of the eyeball muscles becomes impaired, your vision becomes blurry.

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

He is doing special exercises to strengthen his intercostal muscles.

He is doing special exercises to strengthen his mentalis muscle.

He is doing special exercises to strengthen his caninus muscle.

In linear algebra, the upper triangular matrix plays a very important role.

The grammar of 'Jou-nidan' is an important part in learning Japanese.