young fools?

We had a retired math teacher who would sub from time to time when I was in HS who would do this on a stool. Called it the "White Whale"

this is a new fad but I have no idea where it came from. It was on the news last night.

I have adult friends that do this. Check out Emporia Plank on FB.

for the same reason you'd get a tattoo. It is a demonstration of control over one's body.