Okay, we've seen this video on a couple of other websites and they all call it "Jumping off a cliff". Even the headline for the YouTube clip does.
Um...no. Vanderbilt football head coach James Franklin does take a pretty significant leap into Chickamauga Lake near Chattanooga, Tennessee during a "Coaches retreat", but look at the video, it doesn't exactly look like a cliff, does it?
This is a cliff:
This is Franklin's leap. The narration sets it up fairly well, but it looks roughly like jumping from a highway bridge (12-15ft). Impressive, and the narrator says it's Franklin, despite shooting the video from a 1/4 mile away.