Daria’s legs, Gisele’s abs, Natalia’s back—even the world’s most divine figures need fine-tuning. For the April issue of Vogue, six models revealed the secrets behind their best assets, and Vogue.com went behind the scenes at the shoot with photographers Mert Alas and Marcus Piggott in London to talk to them while they were getting ready about the power of confidence, working in the modeling business, and what they consider their favorite body part.