The British models, who helped launch Burberry's new store in Shanghai this month, have given tips to upcoming catwalk stars on how to prepare for shows and insist a model should never take to the runway on an empty stomach, reports contactmusic.com.
"Drink a lot of water, and make sure you've eaten enough. And know where you're walking. That's always a hard one," said Delevingne.
Waterhouse, 22, who is dating Hollywood actor Bradley Cooper, added: "Vitamin C and the hardcore stretching ... always workout."