Claire Dearing (Bryce Dallas Howard), awkwardly outfitted for a fight against GMO dinosaurs (Universal Pictures) High heels work the way they do not just because of aesthetics—the lengthening of the body, the curving and shadowing of the leg—but also because of physics. To stay balanced on heels, be they stiletto-ed or kitten-ed or something in between—to walk upon spikes, essentially, successfully and safely—one must shift one’s center of gravity, stride after stride, so that the back is arched, the shoulders are stretched, and the pelvis is thrust forward.