Heart attack situation. Almost all aquatic facilities are required by law to have in-service training's on a regular basis. For most facilities this is accomplished by having regular sessions where the guards simply get to practice their skills. This is often considered very boring my many guards, but it is understood that it is a requirement of their job. There are many different ways of having in-service training's and skill improvement sessions.
Some facilities try to make the situation fun by playing skill specific games.
With mock drownings, situations occur during a normal swim. The lifeguard is not made aware that it is only a drill and not a real situation. This shows what the guard will do in a real situation as it is what they think it is. Mock drownings shouldn't be done to maintain a supervisors or auditors ego. To accomplish this and prevent any difficulties, the supervisor, or the person who is conducting the audit must be prepared to debrief the situation after it has occurred with everyone involved and to provide feedback.