Which of the following is crucial to prevent complications after surgery?

Avoiding heavy lifting or reaching above the head is crucial to prevent complications after surgery because it helps safeguard the surgical site from undue stress and strain. After surgery, the body needs time to heal, and excessive physical activity, especially involving the upper body and core, can lead to complications such as delayed healing, reopening of the wound, or the development of hernias.

Proper post-operative care often includes specific recommendations regarding physical activity levels, which aim to promote healing while minimizing risks of injury or complications. Engaging in activities that place stress on the surgical area can not only impede the recovery process but may also cause pain and discomfort. Thus, adhering to guidelines about limiting strenuous activities is essential for an optimal recovery.

The other options do not directly address the need for careful physical activity restrictions or may imply a standard practice that isn't specifically tailored to post-surgical care. For example, while maintaining a healthy diet can be beneficial, drinking milk daily does not specifically prevent complications from surgery. Similarly, push-ups and keeping the surgical area covered may not adequately focus on the related risks associated with aggressive physical activity.