Efron tried hard to nail the iconic "Baywatch" run down the beach. The slow-motion jog along the sand is one of the most memorable parts of the classic TV show.
SEE PIC: Priyanka Chopra joins her BAYWATCH squad sans BIKINI in Savannah!
It all got a bit too much for the star as he ran alongside his co-stars, including Johnson, and ended up slipping and hitting the ground, reports mirror.co.uk.
Hotness Alert! Zac Efron goes shirtless on ‘Baywatch’ set- SEE PICS
Later, he couldn't resist sharing an image of the hilarious moment on Twitter.
He wrote: "*think cool thoughts * run cool- hit em w/ that COOL #Baywatch run...
"Oh yeah, Feelin it *think coo- AGH WTF #notcool (sic)"
IANS