What should be the first step when a lifeguard suspects a spinal injury?

When a lifeguard suspects a spinal injury, the first step is to stabilize the head and neck. This action is crucial because movement of the head and neck could potentially worsen any existing injury, leading to further spinal cord damage or complications. By stabilizing these areas, the lifeguard minimizes the risk of exacerbating the injury while preparing for further assessment or assistance.

In the context of a suspected spinal injury, performing stabilization first ensures that the injured person is kept as safe as possible until more advanced care can be provided. This action is a critical component of the lifeguard's duty to care for the individual and manage the situation appropriately. Other options, while important in their own right, follow the immediate need to stabilize the head and neck.