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The cast of Baywatch may only be portraying lifeguards on the screen, but in order to make it believable, they practically have to do a crash course on learning how to actually save lives in the water. And that's not easy, people.

E! News' Maria Menounos sat down with one of the TV show's OGs David Chokachi, who played Cody Madison, to discuss the upcoming reboot of the sexy beach series that aired in the '90s, and Chokachi shares that newcomer Zac Efron is apparently having some trouble when it comes to conquering Mother Nature's waves.

"Alexandra Paul, who is Stephanie on the show, her husband trains triathletes and I know he's training Zac Efron to be ocean competent. Nothing against Zac, but I heard he's got a little struggle going on with his affiliation with the ocean," he tells us.

"He's having a little trouble, let's put it that way."

However, Chokachi isn't trying to throw shade. He quickly admits that he had trouble, too, because it's not as easy as people may think.

"People think, ‘Oh, we're gonna go swim in the ocean.' But it's different. If you're actually going to portray a lifeguard, there's a lot going on—how you enter the water, how you get to a victim...You gotta be legit or you're gonna look like crap on TV," he tells us.

"I'm sure he's struggling because I trained for like three months before we started filming with a real lifeguard, Mike Newman. He kicked my butt. It was hard. The water's freezing, you're running in in your shorts, and you're spending a lot of time in the water, and the waves, you kinda get used to it."

Regardless, the actor said the ocean was "pure magic," and couldn't help but boast about having had the "best job in the world."

"We're showing up at the beach, it's summer time in L.A. We're running around with a bunch of beautiful people and saving lives. How do you get a better job than that?"

Watch the clip above to hear about a possible cast reunion in the film, and tune in to E! News tonight for more from our interview with Chokachi.