Standing on the edge of a building, wearing nothing but a Speedo, tens of thousands of people yelling for you to jump. . . . No, it’s not an anxiety dream. It’s just another day in the life of a professional cliff diver.

On Aug. 25, the Red Bull Cliff Diving World Series returns to Boston, the competitors once again starting on top of the Institute of Contemporary Art and leaping some 26.5 meters — about the height of 2½ Green Monsters — into Boston Harbor.