Mangold Hurling is where you take mangold roots and throw them as far as you can. And like any sport worth its salt, there's an association and a web page devoted to it.
"Away, mangold! Fly away as far as ye can!"
It's a common sport in various cultures, as evidenced by the black pudding throwing we learned about recently, to take something and throw it as far as you can and be judged by the distance and form you achieve.
Why is that? What prompts people to pick things up and see how far the thing can be thrown? It's like man is in a constant war against gravity.