The hair on the back of his arms stood up in reaction.

He touched his hand to the back of her arm.

You will feel the stretch along the back of your arm.

I only had the one sting on the back of my arm.

It had hit him in the back of his arm, the position awkward and hard to get at.

Squeeze the back of your arm when you reach the top.

You should feel the stretch along the back of your bent arm.

I sat rubbing the backs of my arms, looking at him.

Every hair on the back of her arms raised as she heard a low moan.

But I felt something, and it caused the hair to rise on the backs of my arms.