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Baywatch Abs with Alexandra Daddario | Gym Time w/ Zac Efron

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Zac Efron and Alexandra Daddario just relived their most miserable diet ever, one crunch at a time.

Two years after Baywatch hit theaters, Efron brought his old co-star back for an episode of his YouTube series Gym Time w/ Zac Efron, titled “Baywatch Abs with Alexandra Daddario.” The pair traded stories about the brutal prep that got them camera-ready as Matt Brody and Summer Quinn, then put each other through a core session built around balance and endurance rather than the usual crunch-and-count routine. It ends the way these things tend to between old co-stars: a sit-up contest, a loser, and a punishment left dangling for the audience.

• Efron and Daddario trained under Patrick Murphy for Baywatch, following carb-deprived diets and two-a-day workouts to hit the low body-fat numbers the lifeguard roles demanded.
• The Gym Time episode swaps traditional crunches for a circuit of unconventional core-stabilization exercises focused on balance under fatigue.
• The session closes with a head-to-head sit-up competition between the two, with a lighthearted punishment awaiting whoever loses.

Back to the Baywatch Diet

Before either actor threw a punch or ran in slow motion for the 2017 film, they spent months under Murphy’s supervision cutting carbs and doubling up on workouts, a regimen both describe as far more punishing than anything required for a typical role. Efron has talked before about how the physical bar for Baywatch pushed him leaner than any of his prior films, and in this episode he and Daddario swap notes on just how hungry that stretch of prep actually made them.

Daddario’s take on the experience gets right at what made it grueling — not the reps, but the deprivation stacked on top of them.

Two-a-day workouts and barely any carbs — that’s what it actually took to look like a Baywatch lifeguard.

The Untraditional Core Circuit

Rather than run through sit-ups and bicycle crunches on repeat, the Gym Time episode has the pair working through drills built to challenge balance and core stability under fatigue — the kind of functional training Murphy leaned on to build the kind of definition the movie’s poster demanded. It’s less about isolating a muscle and more about forcing the core to fire while the rest of the body is off-balance, which is a very different kind of sore than a standard ab circuit produces.

The two clearly know each other’s tendencies from years of shared press tours and reshoots, and that familiarity shows up as trash talk as much as technique. Fans of Efron’s channel have seen similar dynamics play out in other segments — the same competitive streak that shows up when he’s pushed through extreme physical stretches, like the 24-hour workout stunt he put himself through on camera.

The Sit-Up Showdown

Every core circuit needs a finish line, and this one lands on a straight sit-up contest between Efron and Daddario — the format that decides who walks away with bragging rights and who gets stuck with the punishment teased throughout the episode. Efron doesn’t hide from the outcome in his own description of the video, admitting flatly that he “may or may not have” come up short against his former co-star.

It’s a small, human beat for two actors best known for a summer blockbuster built entirely around looking flawless in swimwear — the same instinct for turning celebrity friendships into lighthearted, competitive content that’s fueled plenty of other reunions across late-night and YouTube alike, the kind of segment fans compare to celebrities trading barbs in a completely different setting.

Efron never spells out exactly what the loser’s punishment is in the episode description, leaving it as the hook to actually watch the video rather than read about it — which, for a channel built on him testing his own limits on camera, is about the most on-brand cliffhanger he could leave.