Nathan Adrian Photograph By Steven Lippman for ESPN

Freestyle swimmer, Nathan Adrian, is used to showing a lot of skin in front of large crowds, so perhaps it's no surprise that he agreed to pose for this year's Body Issue. Here's more from his shoot. "The more flexible you are, the more like an arrow through the water you are, the better. We all have a natural curvature to our spine, but we try to eliminate that when we're swimming."