Lifeguards have to be strong swimmers and trained in CPR>
i bet they do, are you a lifeguard?
No, but they rescue and supervise the safety of swimmers.
what else do they do? do they rescue animals?
The lifeguards are responsible for the people in the water.
what about the people on the beach but out of the water?
Lifeguards can take on their responsibility as volunteers, but it is likely employment.