What is the sport of “Masskrugstemmen”?

It is a Bavarian sport; the name translates loosely into the lifting of a liter mug of beer.  The “Masskrug”, a 1-liter Stein, is to be held with one arm, completely stretched out and parallel to the floor – the goal is simple: to hold the Stein up as long as possible.  It’s a balance between the right technique and strength.  The full 1-liter “Mass” weighs about 5 lbs.!