Final answer:
During cable rotation exercises, the hip extension helps to decrease stress on the lower back by engaging the glutes and hamstrings, which stabilizes the pelvis and reduces the load on the lower back muscles.
Step-by-step explanation:
During the cable rotation exercise, the position of the hip that will help to decrease stress on the lower back is hip extension (D). When you extend the hips, you engage the glutes and hamstrings which helps to stabilize the pelvis and can take some of the load off the lower back. The correct positioning during exercises is crucial for minimizing the risk of injury and ensuring the targeted muscles are effectively worked.
Cable rotations involve the transverse plane, requiring stability through the hips and core; thus, maintaining a neutral spine and extending the hips can support the lower back. It is also important to remember to not excessively arch or flatten the back and to engage the core throughout the movement. The correct technique ensures maximum benefit from the exercise while protecting the back from undue stress.