What is the best immediate response for a lifeguard who witnesses an athlete collapse on the pool deck?

When a lifeguard witnesses an athlete collapse on the pool deck, the best immediate response is to check for breathing and perform CPR if necessary. This action is critical because it addresses the most immediate concern: whether the individual is breathing or has a pulse. If the person is not breathing or shows no signs of life, initiating CPR can be lifesaving. It is essential to act quickly in these situations, as brain damage can occur in just a few minutes without oxygen.

This response prioritizes the athlete's health and safety, demonstrating the lifeguard's training in emergency protocols. While the involvement of bystanders can be helpful, it is not sufficient in a critical situation like this. Relying on others may lead to delays in addressing the athlete's immediate medical needs. Calling for another lifeguard could be a subsequent action, but the priority remains with the individual in distress. Starting a swim meet at this time would be inappropriate and could exacerbate the situation by delaying necessary medical attention.