He started a special exercise to train his infraspinatus muscle.

He is doing special exercises to strengthen his spinalis muscle.

It looked like he had a bony spine on his back.

The mobile phone communication is unstable because the base station in this area is broken.

He is a complete outsider to this issue.

He is facing a difficult situation.

His opinion is the polar opposite of mine.

You can solve this problem using polar coordinates.

He is an excellent arranger, and has produced many musical works.

He is good at playing Beethoven's variations.