1.   Some of these exercises put too much strain on the back muscles.

2.   The usual type of chair puts an enormous strain on the spine, back muscles and many of the internal organs.

3.   When you are lifting heavy loads, be careful not to strain a back muscle.

4.   A sharp ache developed in her back muscles.

5.   Dave pulled a back muscle and could barely kick the ball.

6.   She has been exercising regularly to develop her back muscles.

7.   Berganio had hoped to play in at least six events by now but has only managed four after straining a back muscle in Phoenix.

8.   Buried beneath the abdominal wall and the intestines, shielded from the rear by ribs and back muscles, the abdominal aorta lies at our very pith.

9.   Did you know that slouching when you sit will, over time, lengthen your back muscles, throwing akilter their supporting role?

10.   Enroll in a weightlifting program designed to strengthen back muscles.