On the soft white sands of Grace Bay Beach in Turks and Caicos, I watch the sea stretch out in lazy ribbons of turquoise and aquamarine. Grace Bay consistently ranks among the world's most beautiful ...

During my week at the World Freediving Championships, divers kept telling me I should start training and try it myself someday. So I did start—with an out-of-the-water session on breath-holding—and it ...