As David told the BBC, which followed him on his daily ritual, he stuffs his work gear (and a towel) into a waterproof floating bladder, and tows it alongside his body as he makes the 1.2-mile voyage in his swim trunks. Occasionally, he'll even pick up a cappuccino at a cafe near the spot that he exits the river. He says his colleagues usually him a little grin when they see him arrive all wet, but he's also managed to convince a few of them to start swimming with him.
Of course, Munich's weather isn't ideal for swimming year-round, but that doesn't stop David. He keeps tabs on the river temperature online, and opts for wetsuits during the winter to stay comfortable. He also straps on sandals while in the water, because like any river that winds through a busy city, the bottom can get mucked up with broken glass and plenty of other gunk that'll cut up your feet.