A murmur goes through the bar when Aron Lack picks up something that would make a Viking warrior proud: a double-sided axe, nearly a metre long and weighing more than a kilo. The muscular man, a recreational entrepreneur, lifts the axe and with a powerful swing, sends it hurtling into a wall, where it lands with a thud. Escape rooms, black light mini golf, trampoline jumping – there are always new leisure trends in German cities. The latest craze is axe-throwing bars. Here, patrons swap darts for axes, aiming at wooden targets shaped like tree trunks. From the Vikings to Germany Several compan…