Los Angeles: Actor Zac Efron struggled to keep his cool alongside "Baywatch" co-star Dwayn Johnson as he fell head over heels during an embarrassing moment on the set.
Baywatch team
 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