Zac Efron and his “Baywatch” co-star Alexandra Daddario are reuniting.

The pair, who starred together in the 2017 film adaptation of the hit ’90s series, hit the gym to show fans how to achieve some “Baywatch”-worthy abs.

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Daddario, 33, joined Efron, 31, for the latest episode of his YouTube series “Gym Time”, doing a killer core workout while reminiscing about their days on the beachy set.

The co-stars did a number of core movements, including a medicine ball game which ended badly for Efron when Daddario accidentally slammed a 16-pounder in his face.

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Later, another playful game comes around, but this time lunch is on the line.

New episodes of “Gym Time With Zac Efron” drop Tuesdays on YouTube.