Maintaining a buff bod is also part of the deal. After all, keeping fit is key to getting to a drowning person on time to save him, he says.
He has to be on the alert, not only for swimmers in trouble but also for sunbathers headed for trouble by going topless.
Mr Muhammad Yamin Yusof's duty as one of Sentosa's beach patrol officers is to tell the women to cover up.
It is usually an awkward exchange, but he tries to be "professional", says the 24-year-old with a laugh.
"I just approach them, say 'hi, excuse me, in Singapore... It's not a nude beach here. You cannot... If you don't mind, can cover up?," he says, demonstrating his standard script to this reporter.
He gets a mix of reactions from the women, he confesses.
"Some of them spot us approaching from a distance and start covering up, while others simply flip over after we tell them it's not allowed," he says.
He has also had to step in when couples get hot and heavy at the beach.
"There was a pair on a grass patch really getting into things, and I had to go over and tell them to stop what they were doing, because it's a public place," he says with a chuckle.