The mad thing is, this isn't even the craziest shot... Check out the below montage. Anyone with a fear of heights will join me in saying "man my hands and feet have never sweated so much..."
He captioned this collection of wonderment: "I was able to fit in a quick workout while we were exploring these cliffs. I did 20 push ups & 20 pull ups, but don't try this workout at home. Man, Palm Beach is stunning! #WorkoutWednesday."
Not nearly as stunning as your nerve, mister. P.S. People, do not try this off the cliffs of Moher; Kellan has played a vampire and is therefore used to hanging upside down off rocks.