His native language is Spanish.

He is learning Tibetan language.

They are using English as a common language.

He always speaks in polite language, so he is considered very courteous.

I am thinking of learning the Thao language.

His laughter can be expressed with the onomatopoeic word 'gyahaha'.

He started a special exercise to train his serratus posterior inferior muscle.

By strengthening the posterior scalene muscle, you can reduce neck and shoulder pain.

He is doing a special exercise to train his occipitofrontalis muscle.

She is suffering from Eating Disorder Not Otherwise Specified.