This is a slightly more advanced exercise in which you can vary your grip to help with all-round development. It also helps develop good stability when standing. 

1 Stand tall, facing the cable machine with your feet hip-distance apart, your knees slightly flexed, and your elbows pulled back and tucked into your sides. Hold the handles in an underhand grip with your palms facing up.

2 Inhale slowly, then exhale and extend your arms at the elbow until they are straight. Avoid snapping your arms out and maintain your body position throughout. 

3 Inhale, and flex your arms gently at the elbow to return to the starting position.